diff --git a/backend/.env.development b/backend/.env.development
new file mode 100644
index 0000000..e8e5e8a
--- /dev/null
+++ b/backend/.env.development
@@ -0,0 +1,20 @@
+# --- PostgreSQL (usado pelo Docker Compose e pela connection string abaixo) ---
+POSTGRES_HOST=localhost
+POSTGRES_PORT=5432
+POSTGRES_USER=local_user
+POSTGRES_DB=local_db
+POSTGRES_PASSWORD=local_password
+
+# --- App (lido por src/config.rs) ---
+DATABASE_URL=postgres://local_user:local_password@localhost:5432/local_db
+
+JWT_SECRET=dev-secret-change-in-production
+JWT_EXPIRY_SECS=3600
+JWT_REFRESH_EXPIRY_SECS=2592000
+
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+
+HOST=0.0.0.0
+PORT=8080
+APP_ENV=development
diff --git a/backend/.env.example b/backend/.env.example
new file mode 100644
index 0000000..75abcac
--- /dev/null
+++ b/backend/.env.example
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+# Banco de dados
+DATABASE_URL=postgresql://meowspool:meowspool@localhost:5432/meowspool
+
+# JWT
+JWT_SECRET=troque_por_um_secret_forte_em_producao_minimo_32_chars
+JWT_EXPIRY_SECS=3600
+JWT_REFRESH_EXPIRY_SECS=2592000
+
+# OAuth Google
+GOOGLE_CLIENT_ID=seu_google_client_id.apps.googleusercontent.com
+GOOGLE_CLIENT_SECRET=seu_google_client_secret
+
+# Servidor
+HOST=0.0.0.0
+PORT=8080
+
+# Ambiente (development | production)
+APP_ENV=development
diff --git a/backend/.gitignore b/backend/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
+++ b/backend/.gitignore
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+target/
diff --git a/backend/Cargo.lock b/backend/Cargo.lock
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index 0000000..63f33dc
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+version = "0.11.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c28719294829477f525be0186d13efa9a3c602f7ec202ca9e353d310fb9a002"
+dependencies = [
+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
+
+[[package]]
+name = "zerovec-derive"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eadce39539ca5cb3985590102671f2567e659fca9666581ad3411d59207951f3"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b8848ee67ecc8aedbaf3e4122217aff892639231befc6a1b58d29fff4c2cabaa"
+
+[[package]]
+name = "zune-core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb8a0807f7c01457d0379ba880ba6322660448ddebc890ce29bb64da71fb40f9"
+
+[[package]]
+name = "zune-inflate"
+version = "0.2.54"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73ab332fe2f6680068f3582b16a24f90ad7096d5d39b974d1c0aff0125116f02"
+dependencies = [
+ "simd-adler32",
+]
+
+[[package]]
+name = "zune-jpeg"
+version = "0.5.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec5f41c76397b7da451efd19915684f727d7e1d516384ca6bd0ec43ec94de23c"
+dependencies = [
+ "zune-core",
+]
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
new file mode 100644
index 0000000..ea01224
--- /dev/null
+++ b/backend/Cargo.toml
@@ -0,0 +1,70 @@
+[package]
+name = "meowspool-backend"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "meowspool"
+path = "src/main.rs"
+
+[dependencies]
+# HTTP Framework
+axum = { version = "0.7", features = ["macros"] }
+tower = "0.4"
+tower-http = { version = "0.5", features = ["cors", "trace"] }
+
+# Async Runtime
+tokio = { version = "1", features = ["full"] }
+
+# Database
+sqlx = { version = "0.8", features = [
+    "runtime-tokio-rustls",
+    "postgres",
+    "uuid",
+    "time",
+    "macros",
+] }
+
+# Auth
+jsonwebtoken = "9"
+argon2 = "0.5"
+oauth2 = "4"
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# UUID
+uuid = { version = "1", features = ["v4", "serde"] }
+
+# Time
+time = { version = "0.3", features = ["serde", "serde-well-known"] }
+
+# Errors
+thiserror = "1"
+anyhow = "1"
+
+# Validation
+validator = { version = "0.18", features = ["derive"] }
+
+# Env vars
+dotenvy = "0.15"
+
+# Logging / Tracing
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# HTTP Client (OAuth, Google APIs)
+reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }
+
+# QR Code generation
+qrcode = "0.14"
+image = "0.25"
+base64 = "0.22"
+
+# Async trait
+async-trait = "0.1"
+
+[dev-dependencies]
+tokio = { version = "1", features = ["full"] }
+axum-test = "15"
diff --git a/backend/agent.md b/backend/agent.md
new file mode 100644
index 0000000..26eca40
--- /dev/null
+++ b/backend/agent.md
@@ -0,0 +1,383 @@
+# MeowSpool Backend — Agent Guide
+
+## Visão Geral
+
+Backend da aplicação MeowSpool escrito em **Rust**, utilizando **Axum** como framework HTTP e **SQLx** com **PostgreSQL** como banco de dados. A arquitetura segue o padrão **Hexagonal (Ports & Adapters)**, garantindo que o núcleo do domínio seja completamente isolado de detalhes de infraestrutura.
+
+---
+
+## Stack
+
+| Componente        | Biblioteca                                    | Versão mínima |
+|-------------------|-----------------------------------------------|---------------|
+| HTTP Framework    | `axum`                                        | 0.7           |
+| Async Runtime     | `tokio` (full)                                | 1.x           |
+| ORM / Query       | `sqlx` (postgres, uuid, time, macros)         | 0.8           |
+| Autenticação JWT  | `jsonwebtoken`                                | 9.x           |
+| Hash de senha     | `argon2`                                      | 0.5           |
+| OAuth Google      | `oauth2`                                      | 4.x           |
+| UUID              | `uuid` (v4, serde)                            | 1.x           |
+| Serialização      | `serde`, `serde_json`                         | 1.x           |
+| Erros             | `thiserror`                                   | 1.x           |
+| Env vars          | `dotenvy`                                     | 0.15          |
+| Logging           | `tracing`, `tracing-subscriber`               | 0.1           |
+| Validação         | `validator`                                   | 0.18          |
+| HTTP Client       | `reqwest` (json, rustls-tls)                  | 0.12          |
+| Geração QR Code   | `qrcode`                                      | 0.14          |
+
+---
+
+## Estrutura de Pastas
+
+```
+backend/
+├── Cargo.toml
+├── Cargo.lock
+├── .env.example
+├── agent.md                           <- este arquivo
+├── migrations/                        <- SQL puro, gerenciado pelo SQLx CLI
+│   ├── 20240101000001_create_users.sql
+│   ├── 20240101000002_create_spool_presets.sql
+│   └── 20240101000003_create_filaments.sql
+└── src/
+    ├── main.rs                        <- entry point: inicializa config, DB, router e servidor
+    ├── config.rs                      <- struct Config lida de variáveis de ambiente
+    ├── error.rs                       <- AppError unificado com IntoResponse
+    ├── router.rs                      <- composição de todas as rotas Axum
+    │
+    ├── domain/                        <- NÚCLEO: entidades puras, sem dependências externas
+    │   ├── mod.rs
+    │   ├── user.rs                    <- struct User, enum AuthProvider
+    │   ├── filament.rs                <- struct Filament, enum Material
+    │   └── spool_preset.rs            <- struct SpoolPreset
+    │
+    ├── ports/                         <- INTERFACES: traits que o domínio exige
+    │   ├── mod.rs
+    │   ├── user_repository.rs         <- trait UserRepository
+    │   ├── filament_repository.rs     <- trait FilamentRepository
+    │   └── spool_preset_repository.rs <- trait SpoolPresetRepository
+    │
+    ├── application/                   <- CASOS DE USO: orquestram domínio + ports
+    │   ├── mod.rs
+    │   ├── auth_service.rs            <- login, register, OAuth, refresh, logout
+    │   ├── filament_service.rs        <- CRUD, cálculo de peso líquido, QR, SVG
+    │   └── spool_preset_service.rs    <- CRUD presets (system read-only, user CRUD)
+    │
+    └── adapters/
+        ├── inbound/                   <- HTTP: recebe requisições, delega ao application
+        │   ├── mod.rs
+        │   ├── auth_handler.rs
+        │   ├── filament_handler.rs
+        │   ├── spool_preset_handler.rs
+        │   ├── user_handler.rs
+        │   └── middleware/
+        │       └── auth.rs            <- extrator JWT que popula CurrentUser no estado
+        └── outbound/                  <- INFRAESTRUTURA: implementa as traits de ports
+            ├── mod.rs
+            ├── postgres_user_repo.rs
+            ├── postgres_filament_repo.rs
+            └── postgres_spool_preset_repo.rs
+```
+
+---
+
+## Arquitetura Hexagonal — Regras de Dependência
+
+```
+adapters/inbound (HTTP)
+        |
+        v
+  application (services)
+        |
+        v
+    domain (entidades)
+        |
+        ^
+    ports (traits)
+        |
+        ^
+adapters/outbound (PostgreSQL)
+```
+
+**Regra fundamental:** O `domain` e os `ports` **nunca** importam nada de `adapters` ou `application`. Dependências permitidas no domínio: `uuid`, `serde`, `time`. Qualquer violação é um bug arquitetural.
+
+---
+
+## Rotas da API
+
+Todas as rotas são prefixadas com `/api/v1`.
+
+### Auth — `/api/v1/auth`
+
+| Método | Rota                  | Handler                   | Acesso                         |
+|--------|-----------------------|---------------------------|--------------------------------|
+| POST   | `/register`           | `register_handler`        | Público                        |
+| POST   | `/login`              | `login_handler`           | Público                        |
+| POST   | `/oauth/google`       | `google_oauth_handler`    | Público                        |
+| POST   | `/refresh`            | `refresh_token_handler`   | Público (requer refresh token) |
+| POST   | `/logout`             | `logout_handler`          | Autenticado                    |
+| POST   | `/forgot-password`    | `forgot_password_handler` | Público                        |
+| POST   | `/verify-email`       | `verify_email_handler`    | Público                        |
+| POST   | `/reset-password`     | `reset_password_handler`  | Público (requer token de reset)|
+
+### Users — `/api/v1/users`
+
+| Método | Rota  | Handler             | Acesso      |
+|--------|-------|---------------------|-------------|
+| GET    | `/me` | `get_me_handler`    | Autenticado |
+| PUT    | `/me` | `update_me_handler` | Autenticado |
+
+### Filaments — `/api/v1/filaments`
+
+| Método | Rota              | Handler                    | Acesso      |
+|--------|-------------------|----------------------------|-------------|
+| GET    | `/`               | `list_filaments_handler`   | Autenticado |
+| POST   | `/`               | `create_filament_handler`  | Autenticado |
+| GET    | `/:id`            | `get_filament_handler`     | Autenticado |
+| PUT    | `/:id`            | `update_filament_handler`  | Autenticado |
+| DELETE | `/:id`            | `delete_filament_handler`  | Autenticado |
+| GET    | `/:id/qrcode`     | `get_qrcode_handler`       | Autenticado |
+| GET    | `/:id/label.svg`  | `export_label_handler`     | Autenticado |
+
+**Query params de listagem (`GET /filaments`):**
+- `material` — filtra por tipo (PLA, ABS, PETG, TPU, ASA, PA, PC...)
+- `brand` — filtra por marca
+- `search` — busca em marca, modelo e notas
+- `stock_level` — `low` (<=15%), `medium` (<=35%), `ok` (>35%)
+- `sort` — `net_weight_asc`, `net_weight_desc`, `created_at_desc` (padrão)
+- `page` / `per_page` — paginação (padrão: página 1, 20 itens)
+
+### Spool Presets — `/api/v1/spool-presets`
+
+| Método | Rota     | Handler                  | Acesso                              |
+|--------|----------|--------------------------|-------------------------------------|
+| GET    | `/`      | `list_presets_handler`   | Autenticado                         |
+| POST   | `/`      | `create_preset_handler`  | Autenticado                         |
+| PUT    | `/:id`   | `update_preset_handler`  | Autenticado (apenas presets do user)|
+| DELETE | `/:id`   | `delete_preset_handler`  | Autenticado (apenas presets do user)|
+
+### Dashboard — `/api/v1/dashboard`
+
+| Método | Rota | Handler              | Acesso      |
+|--------|------|----------------------|-------------|
+| GET    | `/`  | `dashboard_handler`  | Autenticado |
+
+**Resposta do dashboard:**
+```json
+{
+  "total_stock_kg": 14.2,
+  "low_stock_count": 3,
+  "by_material": [
+    { "material": "PLA", "count": 4, "total_kg": 5.8 }
+  ],
+  "low_stock_filaments": [
+    { "id": "...", "model": "PETG", "net_weight_g": 120, "percentage": 12 }
+  ],
+  "recent_filaments": [...]
+}
+```
+
+---
+
+## Padrão de Erros
+
+Use `thiserror` em todos os módulos e um `AppError` central em `src/error.rs`:
+
+```rust
+#[derive(Debug, thiserror::Error)]
+pub enum AppError {
+    #[error("not found")]
+    NotFound,
+
+    #[error("unauthorized")]
+    Unauthorized,
+
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("validation error: {0}")]
+    Validation(String),
+
+    #[error("conflict: {0}")]
+    Conflict(String),
+
+    #[error("internal error")]
+    Internal(#[from] anyhow::Error),
+}
+```
+
+`AppError` implementa `IntoResponse` do Axum, mapeando cada variante para o status HTTP correto e body JSON consistente:
+
+```json
+{ "error": "not found", "code": "NOT_FOUND" }
+```
+
+---
+
+## Convenções de Código
+
+### Nomenclatura
+
+- **Structs de domínio:** `PascalCase` — `User`, `Filament`, `SpoolPreset`
+- **Traits (ports):** `PascalCase` com sufixo `Repository` — `UserRepository`
+- **Implementações concretas:** prefixo do banco — `PostgresUserRepository`
+- **Serviços:** sufixo `Service` — `AuthService`, `FilamentService`
+- **Handlers:** sufixo `_handler` — `login_handler`, `create_filament_handler`
+- **DTOs de entrada:** sufixo `Request` — `CreateFilamentRequest`
+- **DTOs de saída:** sufixo `Response` — `FilamentResponse`
+
+### Estrutura de um Handler
+
+Todo handler deve ser uma função async pequena. A lógica de negócio **nunca** fica no handler — ela fica no `application/*_service.rs`.
+
+```rust
+// adapters/inbound/filament_handler.rs
+pub async fn create_filament_handler(
+    State(state): State<AppState>,
+    Extension(current_user): Extension<CurrentUser>,
+    Json(req): Json<CreateFilamentRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let filament = state.filament_service.create(current_user.id, req).await?;
+    Ok((StatusCode::CREATED, Json(FilamentResponse::from(filament))))
+}
+```
+
+### Estrutura de um Service
+
+O service recebe repositórios via injeção de dependência (trait objects em Arc):
+
+```rust
+// application/filament_service.rs
+pub struct FilamentService {
+    repo: Arc<dyn FilamentRepository>,
+    preset_repo: Arc<dyn SpoolPresetRepository>,
+}
+
+impl FilamentService {
+    pub async fn create(&self, user_id: Uuid, req: CreateFilamentRequest) -> Result<Filament, AppError> {
+        // 1. buscar preset para calcular net_weight
+        // 2. calcular net_weight_g = total_weight_g - spool_weight_g
+        // 3. construir entidade Filament
+        // 4. persistir via repo
+        // 5. retornar entidade
+    }
+}
+```
+
+### Estrutura de um Repository (Port)
+
+```rust
+// ports/filament_repository.rs
+#[async_trait::async_trait]
+pub trait FilamentRepository: Send + Sync {
+    async fn find_by_id(&self, id: Uuid, user_id: Uuid) -> Result<Option<Filament>, AppError>;
+    async fn list(&self, user_id: Uuid, filter: FilamentFilter) -> Result<Vec<Filament>, AppError>;
+    async fn create(&self, filament: &Filament) -> Result<Filament, AppError>;
+    async fn update(&self, filament: &Filament) -> Result<Filament, AppError>;
+    async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError>;
+}
+```
+
+---
+
+## Migrations
+
+Use o **SQLx CLI** para gerenciar migrations:
+
+```bash
+# instalar
+cargo install sqlx-cli --no-default-features --features postgres
+
+# criar nova migration
+sqlx migrate add <nome_descritivo>
+
+# aplicar
+sqlx migrate run
+
+# reverter
+sqlx migrate revert
+```
+
+Arquivos ficam em `backend/migrations/`. Nomeie com timestamp e descrição clara.
+
+---
+
+## Variáveis de Ambiente
+
+Copie `.env.example` para `.env` antes de rodar. Veja o arquivo `.env.example` para a lista completa.
+
+---
+
+## Como Adicionar um Novo Endpoint (Passo a Passo)
+
+1. **Domain** — adicione ou modifique a entidade em `src/domain/`.
+2. **Port** — adicione o método necessário no trait em `src/ports/`.
+3. **Outbound Adapter** — implemente o método no repositório PostgreSQL em `src/adapters/outbound/`.
+4. **Application Service** — adicione o caso de uso em `src/application/`, chamando o port.
+5. **Request/Response DTOs** — defina structs com `serde` e `validator` no handler.
+6. **Inbound Handler** — crie o handler em `src/adapters/inbound/`, delegando para o service.
+7. **Router** — registre a rota em `src/router.rs`.
+8. **Migration** — se necessário, crie um arquivo SQL em `migrations/`.
+
+---
+
+## Como Rodar Localmente
+
+```bash
+# na raiz do backend/
+cp .env.example .env
+# edite .env com suas credenciais locais
+
+# subir PostgreSQL via Docker
+docker run -d \
+  --name meowspool-db \
+  -e POSTGRES_USER=meowspool \
+  -e POSTGRES_PASSWORD=meowspool \
+  -e POSTGRES_DB=meowspool \
+  -p 5432:5432 \
+  postgres:16-alpine
+
+# rodar migrations
+sqlx migrate run
+
+# rodar em modo watch (requer cargo-watch)
+cargo watch -x run
+```
+
+---
+
+## Sincronização Offline (Estratégia)
+
+O backend implementa **last-write-wins com timestamp**:
+
+- Toda entidade possui `updated_at` (timestamp UTC).
+- O mobile envia o `updated_at` local no body do PUT.
+- Se o `updated_at` do servidor for mais recente, retorna `409 Conflict` com a versão do servidor.
+- Se o `updated_at` do cliente for mais recente (ou igual), o servidor aceita a atualização.
+
+---
+
+## Geração de QR Code e Etiqueta SVG
+
+### QR Code (`GET /filaments/:id/qrcode`)
+- Gera QR Code com deep link: `meowspool://filaments/:id`
+- Retorna PNG (`image/png`) por padrão, ou SVG com `?format=svg`
+- Biblioteca: crate `qrcode`
+
+### Etiqueta SVG (`GET /filaments/:id/label.svg`)
+- Query params: `width_mm` (padrão: 50), `height_mm` (padrão: 30)
+- Retorna SVG com: cor visual, modelo, material, marca, peso líquido e QR Code embutido
+- `Content-Type: image/svg+xml`
+- `Content-Disposition: attachment; filename="meowspool-label-{id}.svg"`
+
+---
+
+## Segurança
+
+- Senhas hasheadas com **Argon2id** (crate `argon2`).
+- JWT assinado com **HS256** — nunca exponha o `JWT_SECRET`.
+- Toda rota autenticada passa pelo middleware `auth.rs` que valida o token e popula `Extension<CurrentUser>`.
+- Queries usam **bind parameters** do SQLx — nunca interpolação de string em SQL.
+- `user_id` é sempre extraído do token JWT, nunca aceito como parâmetro de URL ou body.
+- Presets do sistema (`is_system = true`) são protegidos no nível de serviço: edição ou deleção retorna `403 Forbidden`.
diff --git a/backend/bruno-routes/MewoSpool/.gitignore b/backend/bruno-routes/MewoSpool/.gitignore
new file mode 100644
index 0000000..e19311f
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/.gitignore
@@ -0,0 +1,9 @@
+# Secrets
+.env*
+
+# Dependencies
+node_modules
+
+# OS files
+.DS_Store
+Thumbs.db
\ No newline at end of file
diff --git a/backend/bruno-routes/MewoSpool/Auth/Forgot Password.yml b/backend/bruno-routes/MewoSpool/Auth/Forgot Password.yml
new file mode 100644
index 0000000..7d9a32a
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Forgot Password.yml	
@@ -0,0 +1,20 @@
+info:
+  name: Forgot Password
+  type: http
+  seq: 5
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/forgot-password
+  body:
+    type: json
+    data: |-
+      {
+        "email": "felipe@felipecncloud.com"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Login.yml b/backend/bruno-routes/MewoSpool/Auth/Login.yml
new file mode 100644
index 0000000..f38d739
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Login.yml
@@ -0,0 +1,21 @@
+info:
+  name: Login
+  type: http
+  seq: 2
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/login
+  body:
+    type: json
+    data: |-
+      {
+        "email": "felipe@felipecncloud.com",
+        "password": "12345678"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Logout.yml b/backend/bruno-routes/MewoSpool/Auth/Logout.yml
new file mode 100644
index 0000000..8dcd385
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Logout.yml
@@ -0,0 +1,24 @@
+info:
+  name: Logout
+  type: http
+  seq: 2
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/logout
+  body:
+    type: json
+    data: |-
+      {
+        "email": "felipe@felipecncloud.com",
+        "password": "l11f06c10"
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/OAuth Google.yml b/backend/bruno-routes/MewoSpool/Auth/OAuth Google.yml
new file mode 100644
index 0000000..7db25d7
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/OAuth Google.yml	
@@ -0,0 +1,20 @@
+info:
+  name: OAuth Google
+  type: http
+  seq: 8
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/oauth/google
+  body:
+    type: json
+    data: |-
+      {
+        "id_token": "{{google_id_token}}"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Refresh Token.yml b/backend/bruno-routes/MewoSpool/Auth/Refresh Token.yml
new file mode 100644
index 0000000..a6bd4c3
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Refresh Token.yml	
@@ -0,0 +1,20 @@
+info:
+  name: Refresh Token
+  type: http
+  seq: 4
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/refresh
+  body:
+    type: json
+    data: |-
+      {
+        "refresh_token": "{{refresh_token}}"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Register.yml b/backend/bruno-routes/MewoSpool/Auth/Register.yml
new file mode 100644
index 0000000..c80ad4e
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Register.yml
@@ -0,0 +1,21 @@
+info:
+  name: Register
+  type: http
+  seq: 1
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/register
+  body:
+    type: json
+    data: |-
+      {
+        "email": "felipe@felipecncloud.com",
+        "password": "12345678"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Reset Password.yml b/backend/bruno-routes/MewoSpool/Auth/Reset Password.yml
new file mode 100644
index 0000000..cbf7d27
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Reset Password.yml	
@@ -0,0 +1,21 @@
+info:
+  name: Reset Password
+  type: http
+  seq: 7
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/reset-password
+  body:
+    type: json
+    data: |-
+      {
+        "token": "{{reset_token}}",
+        "new_password": "novaSenha123"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/Verify Email.yml b/backend/bruno-routes/MewoSpool/Auth/Verify Email.yml
new file mode 100644
index 0000000..fe965d3
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/Verify Email.yml	
@@ -0,0 +1,20 @@
+info:
+  name: Verify Email
+  type: http
+  seq: 6
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/auth/verify-email
+  body:
+    type: json
+    data: |-
+      {
+        "token": "{{email_verify_token}}"
+      }
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Auth/folder.yml b/backend/bruno-routes/MewoSpool/Auth/folder.yml
new file mode 100644
index 0000000..d572964
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Auth/folder.yml
@@ -0,0 +1,6 @@
+info:
+  name: Auth
+  type: folder
+  seq: 2
+
+request: {}
diff --git a/backend/bruno-routes/MewoSpool/Dashboard.yml b/backend/bruno-routes/MewoSpool/Dashboard.yml
new file mode 100644
index 0000000..718bd9f
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Dashboard.yml
@@ -0,0 +1,17 @@
+info:
+  name: Dashboard
+  type: http
+  seq: 1
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/dashboard
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Create Filament.yml b/backend/bruno-routes/MewoSpool/Filaments/Create Filament.yml
new file mode 100644
index 0000000..35fa274
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Create Filament.yml	
@@ -0,0 +1,32 @@
+info:
+  name: Create Filament
+  type: http
+  seq: 2
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/filaments
+  body:
+    type: json
+    data: |-
+      {
+        "material": "PLA",
+        "brand": "Bambu",
+        "model": "PLA Basic",
+        "color_hex": "#FF5733",
+        "spool_preset_id": "{{preset_id}}",
+        "total_weight_g": 1250,
+        "temp_hotend_c": 220,
+        "temp_bed_c": 60,
+        "flow_factor_pct": 1.0,
+        "notes": "Filamento de teste"
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Delete Filament.yml b/backend/bruno-routes/MewoSpool/Filaments/Delete Filament.yml
new file mode 100644
index 0000000..b9ebe6e
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Delete Filament.yml	
@@ -0,0 +1,17 @@
+info:
+  name: Delete Filament
+  type: http
+  seq: 5
+
+http:
+  method: DELETE
+  url: http://0.0.0.0:8080/api/v1/filaments/{{filament_id}}
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Export Label SVG.yml b/backend/bruno-routes/MewoSpool/Filaments/Export Label SVG.yml
new file mode 100644
index 0000000..72855ec
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Export Label SVG.yml	
@@ -0,0 +1,24 @@
+info:
+  name: Export Label SVG
+  type: http
+  seq: 7
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/filaments/{{filament_id}}/label.svg
+  params:
+    - name: width_mm
+      value: "80"
+      enabled: true
+    - name: height_mm
+      value: "30"
+      enabled: true
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Get Filament.yml b/backend/bruno-routes/MewoSpool/Filaments/Get Filament.yml
new file mode 100644
index 0000000..295d9dd
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Get Filament.yml	
@@ -0,0 +1,17 @@
+info:
+  name: Get Filament
+  type: http
+  seq: 3
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/filaments/{{filament_id}}
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Get QR Code.yml b/backend/bruno-routes/MewoSpool/Filaments/Get QR Code.yml
new file mode 100644
index 0000000..e4ae7a4
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Get QR Code.yml	
@@ -0,0 +1,22 @@
+info:
+  name: Get QR Code
+  type: http
+  seq: 6
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/filaments/{{filament_id}}/qrcode
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+runtime:
+  variables:
+    - name: filament_id
+      value: e1edc611-f020-4234-94e5-db5e1393dbf2
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/List Filaments.yml b/backend/bruno-routes/MewoSpool/Filaments/List Filaments.yml
new file mode 100644
index 0000000..2f0f7c5
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/List Filaments.yml	
@@ -0,0 +1,36 @@
+info:
+  name: List Filaments
+  type: http
+  seq: 1
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/filaments
+  params:
+    - name: page
+      value: "1"
+      enabled: true
+    - name: per_page
+      value: "20"
+      enabled: true
+    - name: material
+      value: PLA
+      enabled: false
+    - name: brand
+      value: Bambu
+      enabled: false
+    - name: search
+      value: ""
+      enabled: false
+    - name: stock_level
+      value: low
+      enabled: false
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/Update Filament.yml b/backend/bruno-routes/MewoSpool/Filaments/Update Filament.yml
new file mode 100644
index 0000000..98ddc93
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/Update Filament.yml	
@@ -0,0 +1,32 @@
+info:
+  name: Update Filament
+  type: http
+  seq: 4
+
+http:
+  method: PUT
+  url: http://0.0.0.0:8080/api/v1/filaments/{{filament_id}}
+  body:
+    type: json
+    data: |-
+      {
+        "material": "PETG",
+        "brand": "Bambu",
+        "model": "PETG Basic",
+        "color_hex": "#33A1FF",
+        "spool_preset_id": "{{preset_id}}",
+        "total_weight_g": 1000,
+        "temp_hotend_c": 240,
+        "temp_bed_c": 70,
+        "flow_factor_pct": 1.0,
+        "notes": "Atualizado"
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Filaments/folder.yml b/backend/bruno-routes/MewoSpool/Filaments/folder.yml
new file mode 100644
index 0000000..28381ce
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Filaments/folder.yml
@@ -0,0 +1,6 @@
+info:
+  name: Filaments
+  type: folder
+  seq: 3
+
+request: {}
diff --git a/backend/bruno-routes/MewoSpool/SpoolPresets/Create Spool Preset.yml b/backend/bruno-routes/MewoSpool/SpoolPresets/Create Spool Preset.yml
new file mode 100644
index 0000000..6e90d3f
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/SpoolPresets/Create Spool Preset.yml	
@@ -0,0 +1,24 @@
+info:
+  name: Create Spool Preset
+  type: http
+  seq: 2
+
+http:
+  method: POST
+  url: http://0.0.0.0:8080/api/v1/spool-presets
+  body:
+    type: json
+    data: |-
+      {
+        "name": "Carretel Customizado 300g",
+        "spool_weight_g": 300
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/SpoolPresets/Delete Spool Preset.yml b/backend/bruno-routes/MewoSpool/SpoolPresets/Delete Spool Preset.yml
new file mode 100644
index 0000000..0d930aa
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/SpoolPresets/Delete Spool Preset.yml	
@@ -0,0 +1,17 @@
+info:
+  name: Delete Spool Preset
+  type: http
+  seq: 4
+
+http:
+  method: DELETE
+  url: http://0.0.0.0:8080/api/v1/spool-presets/{{preset_id}}
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/SpoolPresets/List Spool Presets.yml b/backend/bruno-routes/MewoSpool/SpoolPresets/List Spool Presets.yml
new file mode 100644
index 0000000..c2aa136
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/SpoolPresets/List Spool Presets.yml	
@@ -0,0 +1,17 @@
+info:
+  name: List Spool Presets
+  type: http
+  seq: 1
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/spool-presets
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/SpoolPresets/Update Spool Preset.yml b/backend/bruno-routes/MewoSpool/SpoolPresets/Update Spool Preset.yml
new file mode 100644
index 0000000..1eea351
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/SpoolPresets/Update Spool Preset.yml	
@@ -0,0 +1,24 @@
+info:
+  name: Update Spool Preset
+  type: http
+  seq: 3
+
+http:
+  method: PUT
+  url: http://0.0.0.0:8080/api/v1/spool-presets/{{preset_id}}
+  body:
+    type: json
+    data: |-
+      {
+        "name": "Carretel Customizado 350g",
+        "spool_weight_g": 350
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/SpoolPresets/folder.yml b/backend/bruno-routes/MewoSpool/SpoolPresets/folder.yml
new file mode 100644
index 0000000..1b2044f
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/SpoolPresets/folder.yml
@@ -0,0 +1,6 @@
+info:
+  name: SpoolPresets
+  type: folder
+  seq: 4
+
+request: {}
diff --git a/backend/bruno-routes/MewoSpool/Users/Get Me.yml b/backend/bruno-routes/MewoSpool/Users/Get Me.yml
new file mode 100644
index 0000000..4cba86f
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Users/Get Me.yml	
@@ -0,0 +1,17 @@
+info:
+  name: Get Me
+  type: http
+  seq: 1
+
+http:
+  method: GET
+  url: http://0.0.0.0:8080/api/v1/users/me
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Users/Update Me.yml b/backend/bruno-routes/MewoSpool/Users/Update Me.yml
new file mode 100644
index 0000000..56a85be
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Users/Update Me.yml	
@@ -0,0 +1,23 @@
+info:
+  name: Update Me
+  type: http
+  seq: 2
+
+http:
+  method: PUT
+  url: http://0.0.0.0:8080/api/v1/users/me
+  body:
+    type: json
+    data: |-
+      {
+        "email": "felipe@felipecncloud.com"
+      }
+  auth:
+    type: bearer
+    token: "{{access_token}}"
+
+settings:
+  encodeUrl: true
+  timeout: 0
+  followRedirects: true
+  maxRedirects: 5
diff --git a/backend/bruno-routes/MewoSpool/Users/folder.yml b/backend/bruno-routes/MewoSpool/Users/folder.yml
new file mode 100644
index 0000000..f996cdd
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/Users/folder.yml
@@ -0,0 +1,6 @@
+info:
+  name: Users
+  type: folder
+  seq: 5
+
+request: {}
diff --git a/backend/bruno-routes/MewoSpool/environments/route.yml b/backend/bruno-routes/MewoSpool/environments/route.yml
new file mode 100644
index 0000000..249b1ac
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/environments/route.yml
@@ -0,0 +1,10 @@
+name: route
+variables:
+  - secret: true
+    name: access_token
+  - secret: true
+    name: refresh_token
+  - name: preset_id
+    value: 0ffa808d-af09-4bc6-9a40-43df3a4c6dd0
+  - name: filament_id
+    value: e1edc611-f020-4234-94e5-db5e1393dbf2
diff --git a/backend/bruno-routes/MewoSpool/opencollection.yml b/backend/bruno-routes/MewoSpool/opencollection.yml
new file mode 100644
index 0000000..ae53510
--- /dev/null
+++ b/backend/bruno-routes/MewoSpool/opencollection.yml
@@ -0,0 +1,10 @@
+opencollection: 1.0.0
+
+info:
+  name: MewoSpool
+bundled: false
+extensions:
+  bruno:
+    ignore:
+      - node_modules
+      - .git
diff --git a/backend/infra/compose.yaml b/backend/infra/compose.yaml
new file mode 100644
index 0000000..270b605
--- /dev/null
+++ b/backend/infra/compose.yaml
@@ -0,0 +1,17 @@
+services:
+  database:
+    image: "postgres:16.0-alpine3.18"
+    env_file:
+      - ../.env.development
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+volumes:
+  postgres_data:
diff --git a/backend/migrations/20240101000001_create_users.sql b/backend/migrations/20240101000001_create_users.sql
new file mode 100644
index 0000000..eb2fa24
--- /dev/null
+++ b/backend/migrations/20240101000001_create_users.sql
@@ -0,0 +1,16 @@
+-- Migration: 001 - Criar tabela de usuários
+
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+CREATE TABLE users (
+    id              UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    email           TEXT NOT NULL UNIQUE,
+    password_hash   TEXT,
+    google_id       TEXT UNIQUE,
+    email_verified  BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_users_email    ON users (email);
+CREATE INDEX idx_users_google_id ON users (google_id) WHERE google_id IS NOT NULL;
diff --git a/backend/migrations/20240101000002_create_spool_presets.sql b/backend/migrations/20240101000002_create_spool_presets.sql
new file mode 100644
index 0000000..78bd763
--- /dev/null
+++ b/backend/migrations/20240101000002_create_spool_presets.sql
@@ -0,0 +1,30 @@
+-- Migration: 002 - Criar tabela de presets de carretel e inserir presets do sistema
+
+CREATE TABLE spool_presets (
+    id              UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    name            TEXT NOT NULL,
+    spool_weight_g  INTEGER NOT NULL CHECK (spool_weight_g > 0),
+    is_system       BOOLEAN NOT NULL DEFAULT FALSE,
+    user_id         UUID REFERENCES users (id) ON DELETE CASCADE,
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+
+    -- Presets do sistema não têm user_id; presets customizados têm
+    CONSTRAINT chk_preset_ownership CHECK (
+        (is_system = TRUE AND user_id IS NULL) OR
+        (is_system = FALSE AND user_id IS NOT NULL)
+    )
+);
+
+CREATE INDEX idx_spool_presets_user_id  ON spool_presets (user_id) WHERE user_id IS NOT NULL;
+CREATE INDEX idx_spool_presets_is_system ON spool_presets (is_system);
+
+-- Presets built-in do sistema (somente leitura para usuários)
+INSERT INTO spool_presets (name, spool_weight_g, is_system) VALUES
+    ('Bambu Lab (Plástico)',   250, TRUE),
+    ('Elegoo (Papelão)',       200, TRUE),
+    ('Creality (Plástico)',    230, TRUE),
+    ('Prusament (Plástico)',   201, TRUE),
+    ('Sunlu (Papelão)',        200, TRUE),
+    ('Polymaker (Plástico)',   220, TRUE),
+    ('Genérico Papelão 1kg',   200, TRUE),
+    ('Genérico Plástico 1kg',  250, TRUE);
diff --git a/backend/migrations/20240101000003_create_filaments.sql b/backend/migrations/20240101000003_create_filaments.sql
new file mode 100644
index 0000000..4b30773
--- /dev/null
+++ b/backend/migrations/20240101000003_create_filaments.sql
@@ -0,0 +1,26 @@
+-- Migration: 003 - Criar tabela de filamentos
+
+CREATE TABLE filaments (
+    id               UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    user_id          UUID NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    material         TEXT NOT NULL,
+    brand            TEXT NOT NULL,
+    model            TEXT,
+    color_hex        TEXT NOT NULL,
+    spool_preset_id  UUID NOT NULL REFERENCES spool_presets (id),
+    total_weight_g   INTEGER NOT NULL CHECK (total_weight_g > 0),
+    net_weight_g     INTEGER NOT NULL CHECK (net_weight_g >= 0),
+    temp_hotend_c    INTEGER CHECK (temp_hotend_c > 0),
+    temp_bed_c       INTEGER CHECK (temp_bed_c >= 0),
+    flow_factor_pct  DOUBLE PRECISION CHECK (flow_factor_pct > 0),
+    notes            TEXT,
+    updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX idx_filaments_user_id   ON filaments (user_id);
+CREATE INDEX idx_filaments_material  ON filaments (user_id, material);
+CREATE INDEX idx_filaments_brand     ON filaments (user_id, brand);
+CREATE INDEX idx_filaments_updated_at ON filaments (user_id, updated_at DESC);
+-- Índice para suporte a alertas de estoque baixo
+CREATE INDEX idx_filaments_net_weight ON filaments (user_id, net_weight_g);
diff --git a/backend/src/adapters/inbound/auth_handler.rs b/backend/src/adapters/inbound/auth_handler.rs
new file mode 100644
index 0000000..2e08ce1
--- /dev/null
+++ b/backend/src/adapters/inbound/auth_handler.rs
@@ -0,0 +1,190 @@
+use axum::{extract::State, http::StatusCode, response::IntoResponse, Json};
+use serde::{Deserialize, Serialize};
+use validator::Validate;
+
+use crate::{error::AppError, router::AppState};
+
+// -------------------------------------------------------------------------
+// Request / Response DTOs
+// -------------------------------------------------------------------------
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct RegisterRequest {
+    #[validate(email(message = "invalid email format"))]
+    pub email: String,
+    #[validate(length(min = 8, message = "password must be at least 8 characters"))]
+    pub password: String,
+}
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct LoginRequest {
+    #[validate(email)]
+    pub email: String,
+    pub password: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct GoogleOAuthRequest {
+    /// ID token retornado pelo SDK do Google no cliente
+    pub id_token: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct RefreshTokenRequest {
+    pub refresh_token: String,
+}
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct ForgotPasswordRequest {
+    #[validate(email)]
+    pub email: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct VerifyEmailRequest {
+    pub token: String,
+}
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct ResetPasswordRequest {
+    pub token: String,
+    #[validate(length(min = 8))]
+    pub new_password: String,
+}
+
+#[derive(Debug, Serialize)]
+pub struct AuthResponse {
+    pub access_token: String,
+    pub refresh_token: String,
+    pub token_type: &'static str,
+}
+
+// -------------------------------------------------------------------------
+// Handlers
+// -------------------------------------------------------------------------
+
+pub async fn register_handler(
+    State(state): State<AppState>,
+    Json(req): Json<RegisterRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let tokens = state.auth_service.register(req.email, req.password).await?;
+    Ok((
+        StatusCode::CREATED,
+        Json(AuthResponse {
+            access_token: tokens.access_token,
+            refresh_token: tokens.refresh_token,
+            token_type: "Bearer",
+        }),
+    ))
+}
+
+pub async fn login_handler(
+    State(state): State<AppState>,
+    Json(req): Json<LoginRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let tokens = state.auth_service.login(req.email, req.password).await?;
+    Ok(Json(AuthResponse {
+        access_token: tokens.access_token,
+        refresh_token: tokens.refresh_token,
+        token_type: "Bearer",
+    }))
+}
+
+pub async fn google_oauth_handler(
+    State(state): State<AppState>,
+    Json(req): Json<GoogleOAuthRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    // Verificar id_token com a API do Google e extrair sub + email
+    let (google_id, email) = verify_google_id_token(&req.id_token, &state.config.google_client_id).await?;
+    let tokens = state.auth_service.google_oauth(google_id, email).await?;
+    Ok(Json(AuthResponse {
+        access_token: tokens.access_token,
+        refresh_token: tokens.refresh_token,
+        token_type: "Bearer",
+    }))
+}
+
+pub async fn refresh_token_handler(
+    State(state): State<AppState>,
+    Json(req): Json<RefreshTokenRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    let tokens = state.auth_service.refresh_token(&req.refresh_token).await?;
+    Ok(Json(AuthResponse {
+        access_token: tokens.access_token,
+        refresh_token: tokens.refresh_token,
+        token_type: "Bearer",
+    }))
+}
+
+pub async fn logout_handler() -> impl IntoResponse {
+    // JWT é stateless; o cliente descarta os tokens.
+    // Implementação futura: blocklist de refresh tokens via Redis.
+    StatusCode::NO_CONTENT
+}
+
+pub async fn forgot_password_handler(
+    Json(req): Json<ForgotPasswordRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    // TODO: gerar token de reset e enviar email
+    // Retornamos sempre 200 para não vazar informação sobre emails cadastrados
+    Ok(StatusCode::OK)
+}
+
+pub async fn verify_email_handler(
+    Json(_req): Json<VerifyEmailRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    // TODO: validar token e marcar email_verified = true
+    Ok(StatusCode::OK)
+}
+
+pub async fn reset_password_handler(
+    Json(req): Json<ResetPasswordRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    // TODO: validar token de reset e atualizar senha
+    Ok(StatusCode::OK)
+}
+
+// -------------------------------------------------------------------------
+// Helper: verificação de Google ID Token
+// -------------------------------------------------------------------------
+
+/// Verifica o id_token do Google chamando o endpoint tokeninfo e retorna (sub, email).
+async fn verify_google_id_token(
+    id_token: &str,
+    _client_id: &str,
+) -> Result<(String, String), AppError> {
+    let url = format!(
+        "https://oauth2.googleapis.com/tokeninfo?id_token={id_token}"
+    );
+
+    let resp = reqwest::Client::new()
+        .get(&url)
+        .send()
+        .await
+        .map_err(|e| AppError::Internal(e.into()))?;
+
+    if !resp.status().is_success() {
+        return Err(AppError::Unauthorized);
+    }
+
+    let payload: serde_json::Value = resp
+        .json()
+        .await
+        .map_err(|e| AppError::Internal(e.into()))?;
+
+    let sub = payload["sub"]
+        .as_str()
+        .ok_or(AppError::Unauthorized)?
+        .to_string();
+
+    let email = payload["email"]
+        .as_str()
+        .ok_or(AppError::Unauthorized)?
+        .to_string();
+
+    Ok((sub, email))
+}
diff --git a/backend/src/adapters/inbound/filament_handler.rs b/backend/src/adapters/inbound/filament_handler.rs
new file mode 100644
index 0000000..feab234
--- /dev/null
+++ b/backend/src/adapters/inbound/filament_handler.rs
@@ -0,0 +1,311 @@
+use axum::{
+    extract::{Path, Query, State},
+    http::{header, StatusCode},
+    response::IntoResponse,
+    Extension, Json,
+};
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+use validator::Validate;
+
+use crate::{
+    adapters::inbound::middleware::auth::CurrentUser,
+    application::filament_service::{
+        CreateFilamentInput, DashboardStats, MaterialSummary, UpdateFilamentInput,
+    },
+    domain::filament::Filament,
+    error::AppError,
+    ports::FilamentFilter,
+    router::AppState,
+};
+
+// -------------------------------------------------------------------------
+// Query params
+// -------------------------------------------------------------------------
+
+#[derive(Debug, Deserialize, Default)]
+pub struct ListFilamentsQuery {
+    pub material: Option<String>,
+    pub brand: Option<String>,
+    pub search: Option<String>,
+    pub stock_level: Option<String>,
+    pub sort: Option<String>,
+    #[serde(default = "default_page")]
+    pub page: u32,
+    #[serde(default = "default_per_page")]
+    pub per_page: u32,
+}
+
+fn default_page() -> u32 { 1 }
+fn default_per_page() -> u32 { 20 }
+
+#[derive(Debug, Deserialize)]
+pub struct LabelQuery {
+    #[serde(default = "default_width_mm")]
+    pub width_mm: u32,
+    #[serde(default = "default_height_mm")]
+    pub height_mm: u32,
+}
+
+fn default_width_mm() -> u32 { 50 }
+fn default_height_mm() -> u32 { 30 }
+
+// -------------------------------------------------------------------------
+// Request / Response DTOs
+// -------------------------------------------------------------------------
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct CreateFilamentRequest {
+    #[validate(length(min = 1, max = 20))]
+    pub material: String,
+    #[validate(length(min = 1, max = 100))]
+    pub brand: String,
+    #[validate(length(max = 100))]
+    pub model: Option<String>,
+    #[validate(length(min = 4, max = 7))]
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    #[validate(range(min = 1))]
+    pub total_weight_g: i32,
+    pub temp_hotend_c: Option<i32>,
+    pub temp_bed_c: Option<i32>,
+    pub flow_factor_pct: Option<f64>,
+    #[validate(length(max = 1000))]
+    pub notes: Option<String>,
+}
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct UpdateFilamentRequest {
+    #[validate(length(min = 1, max = 20))]
+    pub material: String,
+    #[validate(length(min = 1, max = 100))]
+    pub brand: String,
+    #[validate(length(max = 100))]
+    pub model: Option<String>,
+    #[validate(length(min = 4, max = 7))]
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    #[validate(range(min = 1))]
+    pub total_weight_g: i32,
+    pub temp_hotend_c: Option<i32>,
+    pub temp_bed_c: Option<i32>,
+    pub flow_factor_pct: Option<f64>,
+    #[validate(length(max = 1000))]
+    pub notes: Option<String>,
+    pub client_updated_at: Option<OffsetDateTime>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct FilamentResponse {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub material: String,
+    pub brand: String,
+    pub model: Option<String>,
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    pub total_weight_g: i32,
+    pub net_weight_g: i32,
+    pub stock_percentage: u8,
+    pub temp_hotend_c: Option<i32>,
+    pub temp_bed_c: Option<i32>,
+    pub flow_factor_pct: Option<f64>,
+    pub notes: Option<String>,
+    pub updated_at: OffsetDateTime,
+    pub created_at: OffsetDateTime,
+}
+
+impl From<Filament> for FilamentResponse {
+    fn from(f: Filament) -> Self {
+        let stock_percentage = f.stock_percentage();
+        Self {
+            id: f.id,
+            user_id: f.user_id,
+            material: f.material.to_string(),
+            brand: f.brand,
+            model: f.model,
+            color_hex: f.color_hex,
+            spool_preset_id: f.spool_preset_id,
+            total_weight_g: f.total_weight_g,
+            net_weight_g: f.net_weight_g,
+            stock_percentage,
+            temp_hotend_c: f.temp_hotend_c,
+            temp_bed_c: f.temp_bed_c,
+            flow_factor_pct: f.flow_factor_pct,
+            notes: f.notes,
+            updated_at: f.updated_at,
+            created_at: f.created_at,
+        }
+    }
+}
+
+#[derive(Debug, Serialize)]
+pub struct DashboardResponse {
+    pub total_stock_kg: f64,
+    pub low_stock_count: i64,
+    pub by_material: Vec<MaterialSummaryResponse>,
+    pub low_stock_filaments: Vec<FilamentResponse>,
+    pub recent_filaments: Vec<FilamentResponse>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct MaterialSummaryResponse {
+    pub material: String,
+    pub count: i64,
+    pub total_kg: f64,
+}
+
+impl From<MaterialSummary> for MaterialSummaryResponse {
+    fn from(m: MaterialSummary) -> Self {
+        Self {
+            material: m.material,
+            count: m.count,
+            total_kg: m.total_kg,
+        }
+    }
+}
+
+impl From<DashboardStats> for DashboardResponse {
+    fn from(s: DashboardStats) -> Self {
+        Self {
+            total_stock_kg: s.total_stock_kg,
+            low_stock_count: s.low_stock_count,
+            by_material: s.by_material.into_iter().map(Into::into).collect(),
+            low_stock_filaments: s.low_stock_filaments.into_iter().map(Into::into).collect(),
+            recent_filaments: s.recent_filaments.into_iter().map(Into::into).collect(),
+        }
+    }
+}
+
+// -------------------------------------------------------------------------
+// Handlers
+// -------------------------------------------------------------------------
+
+pub async fn dashboard_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+) -> Result<impl IntoResponse, AppError> {
+    let stats = state.filament_service.dashboard(user.id).await?;
+    Ok(Json(DashboardResponse::from(stats)))
+}
+
+pub async fn list_filaments_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Query(query): Query<ListFilamentsQuery>,
+) -> Result<impl IntoResponse, AppError> {
+    let filter = FilamentFilter {
+        material: query.material,
+        brand: query.brand,
+        search: query.search,
+        stock_level: query.stock_level,
+        sort: None, // TODO: parse sort string para SortOrder
+        page: query.page,
+        per_page: query.per_page,
+    };
+
+    let filaments = state.filament_service.list(user.id, filter).await?;
+    let response: Vec<FilamentResponse> = filaments.into_iter().map(Into::into).collect();
+    Ok(Json(response))
+}
+
+pub async fn create_filament_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Json(req): Json<CreateFilamentRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let input = CreateFilamentInput {
+        material: req.material,
+        brand: req.brand,
+        model: req.model,
+        color_hex: req.color_hex,
+        spool_preset_id: req.spool_preset_id,
+        total_weight_g: req.total_weight_g,
+        temp_hotend_c: req.temp_hotend_c,
+        temp_bed_c: req.temp_bed_c,
+        flow_factor_pct: req.flow_factor_pct,
+        notes: req.notes,
+    };
+    let filament = state.filament_service.create(user.id, input).await?;
+    Ok((StatusCode::CREATED, Json(FilamentResponse::from(filament))))
+}
+
+pub async fn get_filament_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+) -> Result<impl IntoResponse, AppError> {
+    let filament = state.filament_service.get(id, user.id).await?;
+    Ok(Json(FilamentResponse::from(filament)))
+}
+
+pub async fn update_filament_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+    Json(req): Json<UpdateFilamentRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let input = UpdateFilamentInput {
+        material: req.material,
+        brand: req.brand,
+        model: req.model,
+        color_hex: req.color_hex,
+        spool_preset_id: req.spool_preset_id,
+        total_weight_g: req.total_weight_g,
+        temp_hotend_c: req.temp_hotend_c,
+        temp_bed_c: req.temp_bed_c,
+        flow_factor_pct: req.flow_factor_pct,
+        notes: req.notes,
+        client_updated_at: req.client_updated_at,
+    };
+    let filament = state.filament_service.update(id, user.id, input).await?;
+    Ok(Json(FilamentResponse::from(filament)))
+}
+
+pub async fn delete_filament_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+) -> Result<impl IntoResponse, AppError> {
+    state.filament_service.delete(id, user.id).await?;
+    Ok(StatusCode::NO_CONTENT)
+}
+
+pub async fn get_qrcode_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+) -> Result<impl IntoResponse, AppError> {
+    let png = state.filament_service.generate_qrcode_png(id, user.id).await?;
+    Ok((
+        [(header::CONTENT_TYPE, "image/png")],
+        png,
+    ))
+}
+
+pub async fn export_label_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+    Query(query): Query<LabelQuery>,
+) -> Result<impl IntoResponse, AppError> {
+    let svg = state
+        .filament_service
+        .generate_label_svg(id, user.id, query.width_mm, query.height_mm)
+        .await?;
+
+    let filename = format!("meowspool-label-{id}.svg");
+    Ok((
+        [
+            (header::CONTENT_TYPE, "image/svg+xml".to_string()),
+            (
+                header::CONTENT_DISPOSITION,
+                format!("attachment; filename=\"{filename}\""),
+            ),
+        ],
+        svg,
+    ))
+}
diff --git a/backend/src/adapters/inbound/middleware/auth.rs b/backend/src/adapters/inbound/middleware/auth.rs
new file mode 100644
index 0000000..e2a39ee
--- /dev/null
+++ b/backend/src/adapters/inbound/middleware/auth.rs
@@ -0,0 +1,47 @@
+use axum::{
+    extract::{Request, State},
+    middleware::Next,
+    response::Response,
+};
+use uuid::Uuid;
+
+use crate::{error::AppError, router::AppState};
+
+/// Informações do usuário autenticado, injetadas como Extension nos handlers.
+#[derive(Debug, Clone)]
+pub struct CurrentUser {
+    pub id: Uuid,
+    pub email: String,
+}
+
+/// Middleware de autenticação JWT.
+/// Extrai o Bearer token do header Authorization, valida via AuthService
+/// e injeta `CurrentUser` como Extension para uso nos handlers.
+pub async fn auth_middleware(
+    State(state): State<AppState>,
+    mut req: Request,
+    next: Next,
+) -> Result<Response, AppError> {
+    let token = extract_bearer_token(&req)?;
+    let claims = state.auth_service.validate_access_token(token)?;
+
+    let current_user = CurrentUser {
+        id: claims.sub,
+        email: claims.email,
+    };
+
+    req.extensions_mut().insert(current_user);
+    Ok(next.run(req).await)
+}
+
+fn extract_bearer_token(req: &Request) -> Result<&str, AppError> {
+    let header = req
+        .headers()
+        .get(axum::http::header::AUTHORIZATION)
+        .and_then(|v| v.to_str().ok())
+        .ok_or(AppError::Unauthorized)?;
+
+    header
+        .strip_prefix("Bearer ")
+        .ok_or(AppError::Unauthorized)
+}
diff --git a/backend/src/adapters/inbound/middleware/mod.rs b/backend/src/adapters/inbound/middleware/mod.rs
new file mode 100644
index 0000000..0e4a05d
--- /dev/null
+++ b/backend/src/adapters/inbound/middleware/mod.rs
@@ -0,0 +1 @@
+pub mod auth;
diff --git a/backend/src/adapters/inbound/mod.rs b/backend/src/adapters/inbound/mod.rs
new file mode 100644
index 0000000..165a7da
--- /dev/null
+++ b/backend/src/adapters/inbound/mod.rs
@@ -0,0 +1,5 @@
+pub mod auth_handler;
+pub mod filament_handler;
+pub mod middleware;
+pub mod spool_preset_handler;
+pub mod user_handler;
diff --git a/backend/src/adapters/inbound/spool_preset_handler.rs b/backend/src/adapters/inbound/spool_preset_handler.rs
new file mode 100644
index 0000000..0d94670
--- /dev/null
+++ b/backend/src/adapters/inbound/spool_preset_handler.rs
@@ -0,0 +1,106 @@
+use axum::{
+    extract::{Path, State},
+    http::StatusCode,
+    response::IntoResponse,
+    Extension, Json,
+};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+use validator::Validate;
+
+use crate::{
+    adapters::inbound::middleware::auth::CurrentUser,
+    domain::spool_preset::SpoolPreset,
+    error::AppError,
+    router::AppState,
+};
+
+// -------------------------------------------------------------------------
+// Request / Response DTOs
+// -------------------------------------------------------------------------
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct CreatePresetRequest {
+    #[validate(length(min = 1, max = 100))]
+    pub name: String,
+    #[validate(range(min = 1, max = 2000))]
+    pub spool_weight_g: i32,
+}
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct UpdatePresetRequest {
+    #[validate(length(min = 1, max = 100))]
+    pub name: String,
+    #[validate(range(min = 1, max = 2000))]
+    pub spool_weight_g: i32,
+}
+
+#[derive(Debug, Serialize)]
+pub struct SpoolPresetResponse {
+    pub id: Uuid,
+    pub name: String,
+    pub spool_weight_g: i32,
+    pub is_system: bool,
+    pub user_id: Option<Uuid>,
+}
+
+impl From<SpoolPreset> for SpoolPresetResponse {
+    fn from(p: SpoolPreset) -> Self {
+        Self {
+            id: p.id,
+            name: p.name,
+            spool_weight_g: p.spool_weight_g,
+            is_system: p.is_system,
+            user_id: p.user_id,
+        }
+    }
+}
+
+// -------------------------------------------------------------------------
+// Handlers
+// -------------------------------------------------------------------------
+
+pub async fn list_presets_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+) -> Result<impl IntoResponse, AppError> {
+    let presets = state.spool_preset_service.list_for_user(user.id).await?;
+    let response: Vec<SpoolPresetResponse> = presets.into_iter().map(Into::into).collect();
+    Ok(Json(response))
+}
+
+pub async fn create_preset_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Json(req): Json<CreatePresetRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let preset = state
+        .spool_preset_service
+        .create(user.id, req.name, req.spool_weight_g)
+        .await?;
+    Ok((StatusCode::CREATED, Json(SpoolPresetResponse::from(preset))))
+}
+
+pub async fn update_preset_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+    Json(req): Json<UpdatePresetRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    let preset = state
+        .spool_preset_service
+        .update(id, user.id, req.name, req.spool_weight_g)
+        .await?;
+    Ok(Json(SpoolPresetResponse::from(preset)))
+}
+
+pub async fn delete_preset_handler(
+    State(state): State<AppState>,
+    Extension(user): Extension<CurrentUser>,
+    Path(id): Path<Uuid>,
+) -> Result<impl IntoResponse, AppError> {
+    state.spool_preset_service.delete(id, user.id).await?;
+    Ok(StatusCode::NO_CONTENT)
+}
diff --git a/backend/src/adapters/inbound/user_handler.rs b/backend/src/adapters/inbound/user_handler.rs
new file mode 100644
index 0000000..d6af0da
--- /dev/null
+++ b/backend/src/adapters/inbound/user_handler.rs
@@ -0,0 +1,72 @@
+use axum::{extract::State, response::IntoResponse, Extension, Json};
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+use validator::Validate;
+
+use crate::{
+    adapters::inbound::middleware::auth::CurrentUser,
+    domain::user::User,
+    error::AppError,
+    router::AppState,
+};
+
+// -------------------------------------------------------------------------
+// Request / Response DTOs
+// -------------------------------------------------------------------------
+
+#[derive(Debug, Deserialize, Validate)]
+pub struct UpdateMeRequest {
+    #[validate(email)]
+    pub email: Option<String>,
+}
+
+#[derive(Debug, Serialize)]
+pub struct UserResponse {
+    pub id: Uuid,
+    pub email: String,
+    pub email_verified: bool,
+    pub auth_provider: String,
+    pub created_at: OffsetDateTime,
+}
+
+impl From<User> for UserResponse {
+    fn from(u: User) -> Self {
+        let auth_provider = format!("{:?}", u.auth_provider()).to_lowercase();
+        Self {
+            id: u.id,
+            email: u.email,
+            email_verified: u.email_verified,
+            auth_provider,
+            created_at: u.created_at,
+        }
+    }
+}
+
+// -------------------------------------------------------------------------
+// Handlers
+// -------------------------------------------------------------------------
+
+pub async fn get_me_handler(
+    State(state): State<AppState>,
+    Extension(current_user): Extension<CurrentUser>,
+) -> Result<impl IntoResponse, AppError> {
+    let user = state
+        .auth_service
+        .user_repo_ref()
+        .find_by_id(current_user.id)
+        .await?
+        .ok_or(AppError::NotFound)?;
+
+    Ok(Json(UserResponse::from(user)))
+}
+
+pub async fn update_me_handler(
+    State(_state): State<AppState>,
+    Extension(_current_user): Extension<CurrentUser>,
+    Json(req): Json<UpdateMeRequest>,
+) -> Result<impl IntoResponse, AppError> {
+    req.validate()?;
+    // TODO: implementar atualização de perfil
+    Ok(axum::http::StatusCode::OK)
+}
diff --git a/backend/src/adapters/mod.rs b/backend/src/adapters/mod.rs
new file mode 100644
index 0000000..5756441
--- /dev/null
+++ b/backend/src/adapters/mod.rs
@@ -0,0 +1,2 @@
+pub mod inbound;
+pub mod outbound;
diff --git a/backend/src/adapters/outbound/mod.rs b/backend/src/adapters/outbound/mod.rs
new file mode 100644
index 0000000..8907963
--- /dev/null
+++ b/backend/src/adapters/outbound/mod.rs
@@ -0,0 +1,7 @@
+pub mod postgres_filament_repo;
+pub mod postgres_spool_preset_repo;
+pub mod postgres_user_repo;
+
+pub use postgres_filament_repo::PostgresFilamentRepository;
+pub use postgres_spool_preset_repo::PostgresSpoolPresetRepository;
+pub use postgres_user_repo::PostgresUserRepository;
diff --git a/backend/src/adapters/outbound/postgres_filament_repo.rs b/backend/src/adapters/outbound/postgres_filament_repo.rs
new file mode 100644
index 0000000..3a919e0
--- /dev/null
+++ b/backend/src/adapters/outbound/postgres_filament_repo.rs
@@ -0,0 +1,215 @@
+use async_trait::async_trait;
+use sqlx::PgPool;
+use std::sync::Arc;
+use uuid::Uuid;
+
+use crate::{
+    domain::filament::{Filament, Material},
+    error::AppError,
+    ports::{FilamentFilter, FilamentRepository},
+};
+
+pub struct PostgresFilamentRepository {
+    db: Arc<PgPool>,
+}
+
+impl PostgresFilamentRepository {
+    pub fn new(db: Arc<PgPool>) -> Self {
+        Self { db }
+    }
+}
+
+#[async_trait]
+impl FilamentRepository for PostgresFilamentRepository {
+    async fn find_by_id(&self, id: Uuid, user_id: Uuid) -> Result<Option<Filament>, AppError> {
+        let row = sqlx::query_as::<_, FilamentRow>(
+            r#"SELECT id, user_id, material, brand, model, color_hex, spool_preset_id,
+                      total_weight_g, net_weight_g, temp_hotend_c, temp_bed_c,
+                      flow_factor_pct, notes, updated_at, created_at
+               FROM filaments
+               WHERE id = $1 AND user_id = $2"#,
+        )
+        .bind(id)
+        .bind(user_id)
+        .fetch_optional(self.db.as_ref())
+        .await?;
+
+        Ok(row.map(Filament::from))
+    }
+
+    async fn list(&self, user_id: Uuid, filter: FilamentFilter) -> Result<Vec<Filament>, AppError> {
+        let rows = sqlx::query_as::<_, FilamentRow>(
+            r#"SELECT id, user_id, material, brand, model, color_hex, spool_preset_id,
+                      total_weight_g, net_weight_g, temp_hotend_c, temp_bed_c,
+                      flow_factor_pct, notes, updated_at, created_at
+               FROM filaments
+               WHERE user_id = $1
+                 AND ($2::text IS NULL OR material ILIKE $2)
+                 AND ($3::text IS NULL OR brand ILIKE '%' || $3 || '%')
+                 AND ($4::text IS NULL OR (
+                       brand ILIKE '%' || $4 || '%'
+                    OR model ILIKE '%' || $4 || '%'
+                    OR notes ILIKE '%' || $4 || '%'
+                 ))
+                 AND ($5::text IS NULL OR (
+                       ($5 = 'low'    AND net_weight_g::float / 1000.0 * 100 <= 15) OR
+                       ($5 = 'medium' AND net_weight_g::float / 1000.0 * 100 <= 35) OR
+                       ($5 = 'ok'     AND net_weight_g::float / 1000.0 * 100 > 35)
+                 ))
+               ORDER BY created_at DESC
+               LIMIT $6 OFFSET $7"#,
+        )
+        .bind(user_id)
+        .bind(&filter.material)
+        .bind(&filter.brand)
+        .bind(&filter.search)
+        .bind(&filter.stock_level)
+        .bind(filter.per_page as i64)
+        .bind(((filter.page.saturating_sub(1)) * filter.per_page) as i64)
+        .fetch_all(self.db.as_ref())
+        .await?;
+
+        Ok(rows.into_iter().map(Filament::from).collect())
+    }
+
+    async fn count(&self, user_id: Uuid, filter: &FilamentFilter) -> Result<i64, AppError> {
+        let row: (i64,) = sqlx::query_as(
+            r#"SELECT COUNT(*) FROM filaments
+               WHERE user_id = $1
+                 AND ($2::text IS NULL OR material ILIKE $2)
+                 AND ($3::text IS NULL OR brand ILIKE '%' || $3 || '%')
+                 AND ($4::text IS NULL OR (
+                       brand ILIKE '%' || $4 || '%'
+                    OR model ILIKE '%' || $4 || '%'
+                    OR notes ILIKE '%' || $4 || '%'
+                 ))"#,
+        )
+        .bind(user_id)
+        .bind(&filter.material)
+        .bind(&filter.brand)
+        .bind(&filter.search)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(row.0)
+    }
+
+    async fn create(&self, filament: &Filament) -> Result<Filament, AppError> {
+        let row = sqlx::query_as::<_, FilamentRow>(
+            r#"INSERT INTO filaments (
+                id, user_id, material, brand, model, color_hex, spool_preset_id,
+                total_weight_g, net_weight_g, temp_hotend_c, temp_bed_c,
+                flow_factor_pct, notes, updated_at, created_at
+               ) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15)
+               RETURNING id, user_id, material, brand, model, color_hex, spool_preset_id,
+                         total_weight_g, net_weight_g, temp_hotend_c, temp_bed_c,
+                         flow_factor_pct, notes, updated_at, created_at"#,
+        )
+        .bind(filament.id)
+        .bind(filament.user_id)
+        .bind(filament.material.to_string())
+        .bind(&filament.brand)
+        .bind(&filament.model)
+        .bind(&filament.color_hex)
+        .bind(filament.spool_preset_id)
+        .bind(filament.total_weight_g)
+        .bind(filament.net_weight_g)
+        .bind(filament.temp_hotend_c)
+        .bind(filament.temp_bed_c)
+        .bind(filament.flow_factor_pct)
+        .bind(&filament.notes)
+        .bind(filament.updated_at)
+        .bind(filament.created_at)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(Filament::from(row))
+    }
+
+    async fn update(&self, filament: &Filament) -> Result<Filament, AppError> {
+        let row = sqlx::query_as::<_, FilamentRow>(
+            r#"UPDATE filaments SET
+                material = $3, brand = $4, model = $5, color_hex = $6,
+                spool_preset_id = $7, total_weight_g = $8, net_weight_g = $9,
+                temp_hotend_c = $10, temp_bed_c = $11, flow_factor_pct = $12,
+                notes = $13, updated_at = $14
+               WHERE id = $1 AND user_id = $2
+               RETURNING id, user_id, material, brand, model, color_hex, spool_preset_id,
+                         total_weight_g, net_weight_g, temp_hotend_c, temp_bed_c,
+                         flow_factor_pct, notes, updated_at, created_at"#,
+        )
+        .bind(filament.id)
+        .bind(filament.user_id)
+        .bind(filament.material.to_string())
+        .bind(&filament.brand)
+        .bind(&filament.model)
+        .bind(&filament.color_hex)
+        .bind(filament.spool_preset_id)
+        .bind(filament.total_weight_g)
+        .bind(filament.net_weight_g)
+        .bind(filament.temp_hotend_c)
+        .bind(filament.temp_bed_c)
+        .bind(filament.flow_factor_pct)
+        .bind(&filament.notes)
+        .bind(filament.updated_at)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(Filament::from(row))
+    }
+
+    async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError> {
+        sqlx::query("DELETE FROM filaments WHERE id = $1 AND user_id = $2")
+            .bind(id)
+            .bind(user_id)
+            .execute(self.db.as_ref())
+            .await?;
+
+        Ok(())
+    }
+}
+
+// -------------------------------------------------------------------------
+// Mapeamento linha do banco → entidade de domínio
+// -------------------------------------------------------------------------
+
+#[derive(sqlx::FromRow)]
+struct FilamentRow {
+    id: Uuid,
+    user_id: Uuid,
+    material: String,
+    brand: String,
+    model: Option<String>,
+    color_hex: String,
+    spool_preset_id: Uuid,
+    total_weight_g: i32,
+    net_weight_g: i32,
+    temp_hotend_c: Option<i32>,
+    temp_bed_c: Option<i32>,
+    flow_factor_pct: Option<f64>,
+    notes: Option<String>,
+    updated_at: time::OffsetDateTime,
+    created_at: time::OffsetDateTime,
+}
+
+impl From<FilamentRow> for Filament {
+    fn from(row: FilamentRow) -> Self {
+        Self {
+            id: row.id,
+            user_id: row.user_id,
+            material: Material::from(row.material),
+            brand: row.brand,
+            model: row.model,
+            color_hex: row.color_hex,
+            spool_preset_id: row.spool_preset_id,
+            total_weight_g: row.total_weight_g,
+            net_weight_g: row.net_weight_g,
+            temp_hotend_c: row.temp_hotend_c,
+            temp_bed_c: row.temp_bed_c,
+            flow_factor_pct: row.flow_factor_pct,
+            notes: row.notes,
+            updated_at: row.updated_at,
+            created_at: row.created_at,
+        }
+    }
+}
diff --git a/backend/src/adapters/outbound/postgres_spool_preset_repo.rs b/backend/src/adapters/outbound/postgres_spool_preset_repo.rs
new file mode 100644
index 0000000..945223e
--- /dev/null
+++ b/backend/src/adapters/outbound/postgres_spool_preset_repo.rs
@@ -0,0 +1,122 @@
+use async_trait::async_trait;
+use sqlx::PgPool;
+use std::sync::Arc;
+use uuid::Uuid;
+
+use crate::{
+    domain::spool_preset::SpoolPreset,
+    error::AppError,
+    ports::SpoolPresetRepository,
+};
+
+pub struct PostgresSpoolPresetRepository {
+    db: Arc<PgPool>,
+}
+
+impl PostgresSpoolPresetRepository {
+    pub fn new(db: Arc<PgPool>) -> Self {
+        Self { db }
+    }
+}
+
+#[async_trait]
+impl SpoolPresetRepository for PostgresSpoolPresetRepository {
+    async fn list_for_user(&self, user_id: Uuid) -> Result<Vec<SpoolPreset>, AppError> {
+        let rows = sqlx::query_as::<_, SpoolPresetRow>(
+            r#"SELECT id, name, spool_weight_g, is_system, user_id, created_at
+               FROM spool_presets
+               WHERE is_system = true OR user_id = $1
+               ORDER BY is_system DESC, name ASC"#,
+        )
+        .bind(user_id)
+        .fetch_all(self.db.as_ref())
+        .await?;
+
+        Ok(rows.into_iter().map(SpoolPreset::from).collect())
+    }
+
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<SpoolPreset>, AppError> {
+        let row = sqlx::query_as::<_, SpoolPresetRow>(
+            r#"SELECT id, name, spool_weight_g, is_system, user_id, created_at
+               FROM spool_presets WHERE id = $1"#,
+        )
+        .bind(id)
+        .fetch_optional(self.db.as_ref())
+        .await?;
+
+        Ok(row.map(SpoolPreset::from))
+    }
+
+    async fn create(&self, preset: &SpoolPreset) -> Result<SpoolPreset, AppError> {
+        let row = sqlx::query_as::<_, SpoolPresetRow>(
+            r#"INSERT INTO spool_presets (id, name, spool_weight_g, is_system, user_id, created_at)
+               VALUES ($1, $2, $3, $4, $5, $6)
+               RETURNING id, name, spool_weight_g, is_system, user_id, created_at"#,
+        )
+        .bind(preset.id)
+        .bind(&preset.name)
+        .bind(preset.spool_weight_g)
+        .bind(preset.is_system)
+        .bind(preset.user_id)
+        .bind(preset.created_at)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(SpoolPreset::from(row))
+    }
+
+    async fn update(&self, preset: &SpoolPreset) -> Result<SpoolPreset, AppError> {
+        let row = sqlx::query_as::<_, SpoolPresetRow>(
+            r#"UPDATE spool_presets
+               SET name = $2, spool_weight_g = $3
+               WHERE id = $1 AND is_system = false
+               RETURNING id, name, spool_weight_g, is_system, user_id, created_at"#,
+        )
+        .bind(preset.id)
+        .bind(&preset.name)
+        .bind(preset.spool_weight_g)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(SpoolPreset::from(row))
+    }
+
+    async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError> {
+        sqlx::query(
+            "DELETE FROM spool_presets WHERE id = $1 AND user_id = $2 AND is_system = false",
+        )
+        .bind(id)
+        .bind(user_id)
+        .execute(self.db.as_ref())
+        .await?;
+
+        Ok(())
+    }
+}
+
+// -------------------------------------------------------------------------
+// Mapeamento linha do banco → entidade de domínio
+// -------------------------------------------------------------------------
+
+#[derive(sqlx::FromRow)]
+struct SpoolPresetRow {
+    id: Uuid,
+    name: String,
+    spool_weight_g: i32,
+    is_system: bool,
+    user_id: Option<Uuid>,
+    created_at: time::OffsetDateTime,
+}
+
+impl From<SpoolPresetRow> for SpoolPreset {
+    fn from(row: SpoolPresetRow) -> Self {
+        Self {
+            id: row.id,
+            name: row.name,
+            spool_weight_g: row.spool_weight_g,
+            is_system: row.is_system,
+            user_id: row.user_id,
+            created_at: row.created_at,
+        }
+    }
+}
diff --git a/backend/src/adapters/outbound/postgres_user_repo.rs b/backend/src/adapters/outbound/postgres_user_repo.rs
new file mode 100644
index 0000000..526e31e
--- /dev/null
+++ b/backend/src/adapters/outbound/postgres_user_repo.rs
@@ -0,0 +1,132 @@
+use async_trait::async_trait;
+use sqlx::PgPool;
+use std::sync::Arc;
+use uuid::Uuid;
+
+use crate::{domain::user::User, error::AppError, ports::UserRepository};
+
+pub struct PostgresUserRepository {
+    db: Arc<PgPool>,
+}
+
+impl PostgresUserRepository {
+    pub fn new(db: Arc<PgPool>) -> Self {
+        Self { db }
+    }
+}
+
+#[async_trait]
+impl UserRepository for PostgresUserRepository {
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<User>, AppError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            r#"SELECT id, email, password_hash, google_id, email_verified, created_at, updated_at
+               FROM users WHERE id = $1"#,
+        )
+        .bind(id)
+        .fetch_optional(self.db.as_ref())
+        .await?;
+
+        Ok(row.map(User::from))
+    }
+
+    async fn find_by_email(&self, email: &str) -> Result<Option<User>, AppError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            r#"SELECT id, email, password_hash, google_id, email_verified, created_at, updated_at
+               FROM users WHERE email = $1"#,
+        )
+        .bind(email)
+        .fetch_optional(self.db.as_ref())
+        .await?;
+
+        Ok(row.map(User::from))
+    }
+
+    async fn find_by_google_id(&self, google_id: &str) -> Result<Option<User>, AppError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            r#"SELECT id, email, password_hash, google_id, email_verified, created_at, updated_at
+               FROM users WHERE google_id = $1"#,
+        )
+        .bind(google_id)
+        .fetch_optional(self.db.as_ref())
+        .await?;
+
+        Ok(row.map(User::from))
+    }
+
+    async fn create(&self, user: &User) -> Result<User, AppError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            r#"INSERT INTO users (id, email, password_hash, google_id, email_verified, created_at, updated_at)
+               VALUES ($1, $2, $3, $4, $5, $6, $7)
+               RETURNING id, email, password_hash, google_id, email_verified, created_at, updated_at"#,
+        )
+        .bind(user.id)
+        .bind(&user.email)
+        .bind(&user.password_hash)
+        .bind(&user.google_id)
+        .bind(user.email_verified)
+        .bind(user.created_at)
+        .bind(user.updated_at)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(User::from(row))
+    }
+
+    async fn update(&self, user: &User) -> Result<User, AppError> {
+        let row = sqlx::query_as::<_, UserRow>(
+            r#"UPDATE users
+               SET email = $2, password_hash = $3, google_id = $4,
+                   email_verified = $5, updated_at = $6
+               WHERE id = $1
+               RETURNING id, email, password_hash, google_id, email_verified, created_at, updated_at"#,
+        )
+        .bind(user.id)
+        .bind(&user.email)
+        .bind(&user.password_hash)
+        .bind(&user.google_id)
+        .bind(user.email_verified)
+        .bind(user.updated_at)
+        .fetch_one(self.db.as_ref())
+        .await?;
+
+        Ok(User::from(row))
+    }
+
+    async fn verify_email(&self, id: Uuid) -> Result<(), AppError> {
+        sqlx::query("UPDATE users SET email_verified = true, updated_at = NOW() WHERE id = $1")
+            .bind(id)
+            .execute(self.db.as_ref())
+            .await?;
+
+        Ok(())
+    }
+}
+
+// -------------------------------------------------------------------------
+// Mapeamento da linha do banco para entidade de domínio
+// -------------------------------------------------------------------------
+
+#[derive(sqlx::FromRow)]
+struct UserRow {
+    id: Uuid,
+    email: String,
+    password_hash: Option<String>,
+    google_id: Option<String>,
+    email_verified: bool,
+    created_at: time::OffsetDateTime,
+    updated_at: time::OffsetDateTime,
+}
+
+impl From<UserRow> for User {
+    fn from(row: UserRow) -> Self {
+        Self {
+            id: row.id,
+            email: row.email,
+            password_hash: row.password_hash,
+            google_id: row.google_id,
+            email_verified: row.email_verified,
+            created_at: row.created_at,
+            updated_at: row.updated_at,
+        }
+    }
+}
diff --git a/backend/src/application/auth_service.rs b/backend/src/application/auth_service.rs
new file mode 100644
index 0000000..b535ea3
--- /dev/null
+++ b/backend/src/application/auth_service.rs
@@ -0,0 +1,210 @@
+use std::sync::Arc;
+
+use argon2::{
+    password_hash::{rand_core::OsRng, PasswordHash, PasswordHasher, PasswordVerifier, SaltString},
+    Argon2,
+};
+use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+use crate::{
+    config::Config,
+    domain::user::User,
+    error::AppError,
+    ports::UserRepository,
+};
+
+/// Claims do JWT de acesso.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct AccessClaims {
+    pub sub: Uuid,
+    pub email: String,
+    pub exp: i64,
+    pub iat: i64,
+}
+
+/// Claims do JWT de refresh.
+#[derive(Debug, Serialize, Deserialize)]
+pub struct RefreshClaims {
+    pub sub: Uuid,
+    pub exp: i64,
+    pub iat: i64,
+}
+
+/// Par de tokens emitido após login/registro bem-sucedido.
+#[derive(Debug)]
+pub struct TokenPair {
+    pub access_token: String,
+    pub refresh_token: String,
+}
+
+/// Caso de uso de autenticação: registro, login, OAuth, refresh e logout.
+pub struct AuthService {
+    user_repo: Arc<dyn UserRepository>,
+    config: Config,
+}
+
+impl AuthService {
+    pub fn new(user_repo: Arc<dyn UserRepository>, config: Config) -> Self {
+        Self { user_repo, config }
+    }
+
+    /// Expõe o repositório de usuários para uso em outros handlers (ex: user_handler).
+    pub fn user_repo_ref(&self) -> &dyn UserRepository {
+        self.user_repo.as_ref()
+    }
+
+    // -------------------------------------------------------------------------
+    // Registro com email/senha
+    // -------------------------------------------------------------------------
+
+    pub async fn register(&self, email: String, password: String) -> Result<TokenPair, AppError> {
+        if let Some(_) = self.user_repo.find_by_email(&email).await? {
+            return Err(AppError::Conflict("email already registered".into()));
+        }
+
+        let password_hash = hash_password(&password)?;
+        let user = User::new_with_password(email, password_hash);
+        let user = self.user_repo.create(&user).await?;
+
+        self.issue_token_pair(&user)
+    }
+
+    // -------------------------------------------------------------------------
+    // Login com email/senha
+    // -------------------------------------------------------------------------
+
+    pub async fn login(&self, email: String, password: String) -> Result<TokenPair, AppError> {
+        let user = self
+            .user_repo
+            .find_by_email(&email)
+            .await?
+            .ok_or(AppError::Unauthorized)?;
+
+        let hash = user.password_hash.as_deref().ok_or(AppError::Unauthorized)?;
+        verify_password(&password, hash)?;
+
+        self.issue_token_pair(&user)
+    }
+
+    // -------------------------------------------------------------------------
+    // OAuth Google
+    // -------------------------------------------------------------------------
+
+    pub async fn google_oauth(&self, google_id: String, email: String) -> Result<TokenPair, AppError> {
+        let user = match self.user_repo.find_by_google_id(&google_id).await? {
+            Some(u) => u,
+            None => {
+                // Verificar se o email já existe (conta pode ter sido criada com email/senha)
+                match self.user_repo.find_by_email(&email).await? {
+                    Some(mut u) => {
+                        u.google_id = Some(google_id);
+                        u.email_verified = true;
+                        self.user_repo.update(&u).await?
+                    }
+                    None => {
+                        let new_user = User::new_with_google(email, google_id);
+                        self.user_repo.create(&new_user).await?
+                    }
+                }
+            }
+        };
+
+        self.issue_token_pair(&user)
+    }
+
+    // -------------------------------------------------------------------------
+    // Refresh de token
+    // -------------------------------------------------------------------------
+
+    pub async fn refresh_token(&self, refresh_token: &str) -> Result<TokenPair, AppError> {
+        let claims = self.decode_refresh_token(refresh_token)?;
+        let user = self
+            .user_repo
+            .find_by_id(claims.sub)
+            .await?
+            .ok_or(AppError::Unauthorized)?;
+
+        self.issue_token_pair(&user)
+    }
+
+    // -------------------------------------------------------------------------
+    // Validação de access token (usado pelo middleware)
+    // -------------------------------------------------------------------------
+
+    pub fn validate_access_token(&self, token: &str) -> Result<AccessClaims, AppError> {
+        decode::<AccessClaims>(
+            token,
+            &DecodingKey::from_secret(self.config.jwt_secret.as_bytes()),
+            &Validation::default(),
+        )
+        .map(|data| data.claims)
+        .map_err(|_| AppError::Unauthorized)
+    }
+
+    // -------------------------------------------------------------------------
+    // Helpers privados
+    // -------------------------------------------------------------------------
+
+    fn issue_token_pair(&self, user: &User) -> Result<TokenPair, AppError> {
+        let now = OffsetDateTime::now_utc().unix_timestamp();
+        let access_exp = now + self.config.jwt_expiry_secs as i64;
+        let refresh_exp = now + self.config.jwt_refresh_expiry_secs as i64;
+
+        let access_claims = AccessClaims {
+            sub: user.id,
+            email: user.email.clone(),
+            exp: access_exp,
+            iat: now,
+        };
+
+        let refresh_claims = RefreshClaims {
+            sub: user.id,
+            exp: refresh_exp,
+            iat: now,
+        };
+
+        let key = EncodingKey::from_secret(self.config.jwt_secret.as_bytes());
+
+        let access_token = encode(&Header::default(), &access_claims, &key)
+            .map_err(|e| AppError::Internal(e.into()))?;
+
+        let refresh_token = encode(&Header::default(), &refresh_claims, &key)
+            .map_err(|e| AppError::Internal(e.into()))?;
+
+        Ok(TokenPair { access_token, refresh_token })
+    }
+
+    fn decode_refresh_token(&self, token: &str) -> Result<RefreshClaims, AppError> {
+        decode::<RefreshClaims>(
+            token,
+            &DecodingKey::from_secret(self.config.jwt_secret.as_bytes()),
+            &Validation::default(),
+        )
+        .map(|data| data.claims)
+        .map_err(|_| AppError::Unauthorized)
+    }
+}
+
+// -------------------------------------------------------------------------
+// Funções utilitárias de hash (fora do impl para facilitar testes)
+// -------------------------------------------------------------------------
+
+pub fn hash_password(password: &str) -> Result<String, AppError> {
+    let salt = SaltString::generate(&mut OsRng);
+    let argon2 = Argon2::default();
+    argon2
+        .hash_password(password.as_bytes(), &salt)
+        .map(|h| h.to_string())
+        .map_err(|e| AppError::Internal(anyhow::anyhow!("Password hashing failed: {e}")))
+}
+
+pub fn verify_password(password: &str, hash: &str) -> Result<(), AppError> {
+    let parsed_hash = PasswordHash::new(hash)
+        .map_err(|e| AppError::Internal(anyhow::anyhow!("Invalid password hash: {e}")))?;
+    Argon2::default()
+        .verify_password(password.as_bytes(), &parsed_hash)
+        .map_err(|_| AppError::Unauthorized)
+}
diff --git a/backend/src/application/filament_service.rs b/backend/src/application/filament_service.rs
new file mode 100644
index 0000000..9941006
--- /dev/null
+++ b/backend/src/application/filament_service.rs
@@ -0,0 +1,316 @@
+use std::sync::Arc;
+
+use base64::{engine::general_purpose::STANDARD, Engine};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+use crate::{
+    domain::filament::{Filament, Material},
+    error::AppError,
+    ports::{FilamentFilter, FilamentRepository, SpoolPresetRepository},
+};
+
+/// DTO de entrada para criação de filamento.
+#[derive(Debug)]
+pub struct CreateFilamentInput {
+    pub material: String,
+    pub brand: String,
+    pub model: Option<String>,
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    pub total_weight_g: i32,
+    pub temp_hotend_c: Option<i32>,
+    pub temp_bed_c: Option<i32>,
+    pub flow_factor_pct: Option<f64>,
+    pub notes: Option<String>,
+}
+
+/// DTO de entrada para atualização de filamento.
+#[derive(Debug)]
+pub struct UpdateFilamentInput {
+    pub material: String,
+    pub brand: String,
+    pub model: Option<String>,
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    pub total_weight_g: i32,
+    pub temp_hotend_c: Option<i32>,
+    pub temp_bed_c: Option<i32>,
+    pub flow_factor_pct: Option<f64>,
+    pub notes: Option<String>,
+    /// Timestamp do cliente para resolução de conflito offline-first
+    pub client_updated_at: Option<OffsetDateTime>,
+}
+
+/// Estatísticas do dashboard.
+#[derive(Debug)]
+pub struct DashboardStats {
+    pub total_stock_kg: f64,
+    pub low_stock_count: i64,
+    pub by_material: Vec<MaterialSummary>,
+    pub low_stock_filaments: Vec<Filament>,
+    pub recent_filaments: Vec<Filament>,
+}
+
+#[derive(Debug)]
+pub struct MaterialSummary {
+    pub material: String,
+    pub count: i64,
+    pub total_kg: f64,
+}
+
+/// Casos de uso relacionados ao inventário de filamentos.
+pub struct FilamentService {
+    repo: Arc<dyn FilamentRepository>,
+    preset_repo: Arc<dyn SpoolPresetRepository>,
+}
+
+impl FilamentService {
+    pub fn new(repo: Arc<dyn FilamentRepository>, preset_repo: Arc<dyn SpoolPresetRepository>) -> Self {
+        Self { repo, preset_repo }
+    }
+
+    // -------------------------------------------------------------------------
+    // CRUD
+    // -------------------------------------------------------------------------
+
+    pub async fn create(&self, user_id: Uuid, input: CreateFilamentInput) -> Result<Filament, AppError> {
+        let preset = self
+            .preset_repo
+            .find_by_id(input.spool_preset_id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        let net_weight_g = (input.total_weight_g - preset.spool_weight_g).max(0);
+        let now = OffsetDateTime::now_utc();
+
+        let filament = Filament {
+            id: Uuid::new_v4(),
+            user_id,
+            material: Material::from(input.material),
+            brand: input.brand,
+            model: input.model,
+            color_hex: input.color_hex,
+            spool_preset_id: input.spool_preset_id,
+            total_weight_g: input.total_weight_g,
+            net_weight_g,
+            temp_hotend_c: input.temp_hotend_c,
+            temp_bed_c: input.temp_bed_c,
+            flow_factor_pct: input.flow_factor_pct,
+            notes: input.notes,
+            updated_at: now,
+            created_at: now,
+        };
+
+        self.repo.create(&filament).await
+    }
+
+    pub async fn get(&self, id: Uuid, user_id: Uuid) -> Result<Filament, AppError> {
+        self.repo
+            .find_by_id(id, user_id)
+            .await?
+            .ok_or(AppError::NotFound)
+    }
+
+    pub async fn list(
+        &self,
+        user_id: Uuid,
+        filter: FilamentFilter,
+    ) -> Result<Vec<Filament>, AppError> {
+        self.repo.list(user_id, filter).await
+    }
+
+    pub async fn update(
+        &self,
+        id: Uuid,
+        user_id: Uuid,
+        input: UpdateFilamentInput,
+    ) -> Result<Filament, AppError> {
+        let mut existing = self
+            .repo
+            .find_by_id(id, user_id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        // Resolução de conflito offline-first: rejeita se servidor é mais recente
+        if let Some(client_ts) = input.client_updated_at {
+            if existing.updated_at > client_ts {
+                return Err(AppError::Conflict(
+                    "server version is newer than client version".into(),
+                ));
+            }
+        }
+
+        let preset = self
+            .preset_repo
+            .find_by_id(input.spool_preset_id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        let net_weight_g = (input.total_weight_g - preset.spool_weight_g).max(0);
+
+        existing.material = Material::from(input.material);
+        existing.brand = input.brand;
+        existing.model = input.model;
+        existing.color_hex = input.color_hex;
+        existing.spool_preset_id = input.spool_preset_id;
+        existing.total_weight_g = input.total_weight_g;
+        existing.net_weight_g = net_weight_g;
+        existing.temp_hotend_c = input.temp_hotend_c;
+        existing.temp_bed_c = input.temp_bed_c;
+        existing.flow_factor_pct = input.flow_factor_pct;
+        existing.notes = input.notes;
+        existing.updated_at = OffsetDateTime::now_utc();
+
+        self.repo.update(&existing).await
+    }
+
+    pub async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError> {
+        self.repo
+            .find_by_id(id, user_id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        self.repo.delete(id, user_id).await
+    }
+
+    // -------------------------------------------------------------------------
+    // Dashboard
+    // -------------------------------------------------------------------------
+
+    pub async fn dashboard(&self, user_id: Uuid) -> Result<DashboardStats, AppError> {
+        let all = self.repo.list(user_id, FilamentFilter::default()).await?;
+
+        let total_stock_kg = all.iter().map(|f| f.net_weight_g as f64).sum::<f64>() / 1000.0;
+
+        let low_stock_count = all.iter().filter(|f| f.is_low_stock()).count() as i64;
+
+        // Agrupamento por material
+        let mut by_material: std::collections::HashMap<String, (i64, f64)> = Default::default();
+        for f in &all {
+            let entry = by_material.entry(f.material.to_string()).or_default();
+            entry.0 += 1;
+            entry.1 += f.net_weight_g as f64 / 1000.0;
+        }
+        let mut by_material: Vec<MaterialSummary> = by_material
+            .into_iter()
+            .map(|(material, (count, total_kg))| MaterialSummary {
+                material,
+                count,
+                total_kg,
+            })
+            .collect();
+        by_material.sort_by(|a, b| b.count.cmp(&a.count));
+
+        let low_stock_filaments: Vec<Filament> = all
+            .iter()
+            .filter(|f| f.is_low_stock())
+            .cloned()
+            .collect();
+
+        let mut recent = all.clone();
+        recent.sort_by(|a, b| b.created_at.cmp(&a.created_at));
+        let recent_filaments = recent.into_iter().take(5).collect();
+
+        Ok(DashboardStats {
+            total_stock_kg,
+            low_stock_count,
+            by_material,
+            low_stock_filaments,
+            recent_filaments,
+        })
+    }
+
+    // -------------------------------------------------------------------------
+    // QR Code
+    // -------------------------------------------------------------------------
+
+    pub async fn generate_qrcode_png(&self, id: Uuid, user_id: Uuid) -> Result<Vec<u8>, AppError> {
+        self.get(id, user_id).await?;
+
+        let deep_link = format!("meowspool://filaments/{id}");
+        let code = qrcode::QrCode::new(deep_link.as_bytes())
+            .map_err(|e| AppError::Internal(anyhow::anyhow!("QR Code generation failed: {e}")))?;
+
+        let image = code
+            .render::<image::Luma<u8>>()
+            .min_dimensions(200, 200)
+            .build();
+
+        let mut buf = Vec::new();
+        image::DynamicImage::ImageLuma8(image)
+            .write_to(&mut std::io::Cursor::new(&mut buf), image::ImageFormat::Png)
+            .map_err(|e| AppError::Internal(anyhow::anyhow!("PNG encoding failed: {e}")))?;
+
+        Ok(buf)
+    }
+
+    // -------------------------------------------------------------------------
+    // SVG Label
+    // -------------------------------------------------------------------------
+
+    pub async fn generate_label_svg(
+        &self,
+        id: Uuid,
+        user_id: Uuid,
+        width_mm: u32,
+        height_mm: u32,
+    ) -> Result<String, AppError> {
+        let filament = self.get(id, user_id).await?;
+
+        // Gerar QR Code como PNG base64 para embutir no SVG
+        let qr_png = self.generate_qrcode_png(id, user_id).await?;
+        let qr_b64 = STANDARD.encode(&qr_png);
+
+        // Escala: 1mm = ~3.78px (96dpi)
+        let px_per_mm = 3.78_f64;
+        let width_px = (width_mm as f64 * px_per_mm) as u32;
+        let height_px = (height_mm as f64 * px_per_mm) as u32;
+        let qr_size = (height_px as f64 * 0.8) as u32;
+
+        let model_name = filament.model.as_deref().unwrap_or("—");
+        let net_weight = filament.net_weight_g;
+        let material = filament.material.to_string();
+        let brand = &filament.brand;
+        let color = &filament.color_hex;
+
+        let svg = format!(
+            r##"<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="{width_px}px" height="{height_px}px" viewBox="0 0 {width_px} {height_px}">
+  <rect width="{width_px}" height="{height_px}" fill="#1E1B18" rx="4"/>
+  <!-- Color swatch -->
+  <rect x="6" y="6" width="14" height="{h}" fill="{color}" rx="2"/>
+  <!-- Text block -->
+  <text x="26" y="20" font-family="Inter, sans-serif" font-size="10" font-weight="700" fill="#F5EEDC">{model_name}</text>
+  <text x="26" y="33" font-family="Inter, sans-serif" font-size="8" fill="#C9C1B0">{brand} · {material}</text>
+  <text x="26" y="46" font-family="Inter, sans-serif" font-size="9" font-weight="600" fill="#38BCC2">{net_weight}g</text>
+  <!-- QR Code -->
+  <image x="{qr_x}" y="{qr_y}" width="{qr_size}" height="{qr_size}"
+         xlink:href="data:image/png;base64,{qr_b64}"/>
+</svg>"##,
+            width_px = width_px,
+            height_px = height_px,
+            h = height_px - 12,
+            color = color,
+            model_name = escape_xml(model_name),
+            brand = escape_xml(brand),
+            material = escape_xml(&material),
+            net_weight = net_weight,
+            qr_size = qr_size,
+            qr_x = width_px - qr_size - 4,
+            qr_y = (height_px - qr_size) / 2,
+            qr_b64 = qr_b64,
+        );
+
+        Ok(svg)
+    }
+}
+
+fn escape_xml(s: &str) -> String {
+    s.replace('&', "&amp;")
+        .replace('<', "&lt;")
+        .replace('>', "&gt;")
+        .replace('"', "&quot;")
+        .replace('\'', "&apos;")
+}
diff --git a/backend/src/application/mod.rs b/backend/src/application/mod.rs
new file mode 100644
index 0000000..b3e2352
--- /dev/null
+++ b/backend/src/application/mod.rs
@@ -0,0 +1,7 @@
+pub mod auth_service;
+pub mod filament_service;
+pub mod spool_preset_service;
+
+pub use auth_service::AuthService;
+pub use filament_service::FilamentService;
+pub use spool_preset_service::SpoolPresetService;
diff --git a/backend/src/application/spool_preset_service.rs b/backend/src/application/spool_preset_service.rs
new file mode 100644
index 0000000..4bf996a
--- /dev/null
+++ b/backend/src/application/spool_preset_service.rs
@@ -0,0 +1,72 @@
+use std::sync::Arc;
+
+use uuid::Uuid;
+
+use crate::{
+    domain::spool_preset::SpoolPreset,
+    error::AppError,
+    ports::SpoolPresetRepository,
+};
+
+/// Casos de uso para gerenciamento de presets de carretel.
+pub struct SpoolPresetService {
+    repo: Arc<dyn SpoolPresetRepository>,
+}
+
+impl SpoolPresetService {
+    pub fn new(repo: Arc<dyn SpoolPresetRepository>) -> Self {
+        Self { repo }
+    }
+
+    /// Retorna presets do sistema + presets customizados do usuário.
+    pub async fn list_for_user(&self, user_id: Uuid) -> Result<Vec<SpoolPreset>, AppError> {
+        self.repo.list_for_user(user_id).await
+    }
+
+    pub async fn create(
+        &self,
+        user_id: Uuid,
+        name: String,
+        spool_weight_g: i32,
+    ) -> Result<SpoolPreset, AppError> {
+        let preset = SpoolPreset::new_custom(name, spool_weight_g, user_id);
+        self.repo.create(&preset).await
+    }
+
+    pub async fn update(
+        &self,
+        id: Uuid,
+        user_id: Uuid,
+        name: String,
+        spool_weight_g: i32,
+    ) -> Result<SpoolPreset, AppError> {
+        let mut preset = self
+            .repo
+            .find_by_id(id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        if !preset.is_editable_by(user_id) {
+            return Err(AppError::Forbidden);
+        }
+
+        preset.name = name;
+        preset.spool_weight_g = spool_weight_g;
+
+        self.repo.update(&preset).await
+    }
+
+    pub async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError> {
+        let preset = self
+            .repo
+            .find_by_id(id)
+            .await?
+            .ok_or(AppError::NotFound)?;
+
+        if !preset.is_editable_by(user_id) {
+            return Err(AppError::Forbidden);
+        }
+
+        self.repo.delete(id, user_id).await
+    }
+}
diff --git a/backend/src/config.rs b/backend/src/config.rs
new file mode 100644
index 0000000..cec7032
--- /dev/null
+++ b/backend/src/config.rs
@@ -0,0 +1,72 @@
+use anyhow::Context;
+
+/// Configuração central da aplicação, lida de variáveis de ambiente.
+#[derive(Debug, Clone)]
+pub struct Config {
+    pub database_url: String,
+    pub jwt_secret: String,
+    pub jwt_expiry_secs: u64,
+    pub jwt_refresh_expiry_secs: u64,
+    pub google_client_id: String,
+    pub google_client_secret: String,
+    pub host: String,
+    pub port: u16,
+    pub app_env: AppEnv,
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum AppEnv {
+    Development,
+    Production,
+}
+
+impl Config {
+    pub fn from_env() -> anyhow::Result<Self> {
+        Ok(Self {
+            database_url: required("DATABASE_URL")?,
+            jwt_secret: required("JWT_SECRET")?,
+            jwt_expiry_secs: optional("JWT_EXPIRY_SECS", 3600)?,
+            jwt_refresh_expiry_secs: optional("JWT_REFRESH_EXPIRY_SECS", 2_592_000)?,
+            google_client_id: optional_string("GOOGLE_CLIENT_ID"),
+            google_client_secret: optional_string("GOOGLE_CLIENT_SECRET"),
+            host: optional_string_default("HOST", "0.0.0.0"),
+            port: optional("PORT", 8080)?,
+            app_env: parse_app_env(),
+        })
+    }
+
+    pub fn is_production(&self) -> bool {
+        self.app_env == AppEnv::Production
+    }
+}
+
+fn required(key: &str) -> anyhow::Result<String> {
+    std::env::var(key).with_context(|| format!("Missing required env var: {key}"))
+}
+
+fn optional<T: std::str::FromStr>(key: &str, default: T) -> anyhow::Result<T>
+where
+    T::Err: std::fmt::Debug,
+{
+    match std::env::var(key) {
+        Ok(val) => val
+            .parse::<T>()
+            .map_err(|e| anyhow::anyhow!("Invalid value for {key}: {e:?}")),
+        Err(_) => Ok(default),
+    }
+}
+
+fn optional_string(key: &str) -> String {
+    std::env::var(key).unwrap_or_default()
+}
+
+fn optional_string_default(key: &str, default: &str) -> String {
+    std::env::var(key).unwrap_or_else(|_| default.to_string())
+}
+
+fn parse_app_env() -> AppEnv {
+    match std::env::var("APP_ENV").as_deref() {
+        Ok("production") => AppEnv::Production,
+        _ => AppEnv::Development,
+    }
+}
diff --git a/backend/src/domain/filament.rs b/backend/src/domain/filament.rs
new file mode 100644
index 0000000..a820e61
--- /dev/null
+++ b/backend/src/domain/filament.rs
@@ -0,0 +1,99 @@
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+/// Entidade de domínio que representa um carretel de filamento no inventário.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Filament {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub material: Material,
+    pub brand: String,
+    pub model: Option<String>,
+    /// Cor em formato hex, ex: "#FF5733"
+    pub color_hex: String,
+    pub spool_preset_id: Uuid,
+    /// Peso total medido na balança (gramas)
+    pub total_weight_g: i32,
+    /// Calculado: total_weight_g - preset.spool_weight_g
+    pub net_weight_g: i32,
+    /// Temperatura do hotend em °C (opcional)
+    pub temp_hotend_c: Option<i32>,
+    /// Temperatura da mesa em °C (opcional)
+    pub temp_bed_c: Option<i32>,
+    /// Fator de fluxo/extrusão em % (opcional)
+    pub flow_factor_pct: Option<f64>,
+    pub notes: Option<String>,
+    pub updated_at: OffsetDateTime,
+    pub created_at: OffsetDateTime,
+}
+
+/// Tipos de material suportados pelo sistema.
+/// Armazenado como TEXT no banco de dados.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum Material {
+    #[serde(rename = "PLA")]
+    Pla,
+    #[serde(rename = "ABS")]
+    Abs,
+    #[serde(rename = "PETG")]
+    Petg,
+    #[serde(rename = "TPU")]
+    Tpu,
+    #[serde(rename = "ASA")]
+    Asa,
+    #[serde(rename = "PA")]
+    Pa,
+    #[serde(rename = "PC")]
+    Pc,
+    /// Outros materiais não listados acima
+    Other(String),
+}
+
+impl std::fmt::Display for Material {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Pla => write!(f, "PLA"),
+            Self::Abs => write!(f, "ABS"),
+            Self::Petg => write!(f, "PETG"),
+            Self::Tpu => write!(f, "TPU"),
+            Self::Asa => write!(f, "ASA"),
+            Self::Pa => write!(f, "PA"),
+            Self::Pc => write!(f, "PC"),
+            Self::Other(s) => write!(f, "{s}"),
+        }
+    }
+}
+
+impl From<String> for Material {
+    fn from(s: String) -> Self {
+        match s.to_uppercase().as_str() {
+            "PLA" => Self::Pla,
+            "ABS" => Self::Abs,
+            "PETG" => Self::Petg,
+            "TPU" => Self::Tpu,
+            "ASA" => Self::Asa,
+            "PA" => Self::Pa,
+            "PC" => Self::Pc,
+            other => Self::Other(other.to_string()),
+        }
+    }
+}
+
+impl Filament {
+    /// Calcula o percentual de filamento restante em relação ao peso nominal de 1kg.
+    /// Usado para alertas de estoque: <=15% = crítico, <=35% = baixo.
+    pub fn stock_percentage(&self) -> u8 {
+        let nominal_g = 1000_f64;
+        let pct = (self.net_weight_g as f64 / nominal_g * 100.0).round() as i32;
+        pct.clamp(0, 100) as u8
+    }
+
+    pub fn is_low_stock(&self) -> bool {
+        self.stock_percentage() <= 35
+    }
+
+    pub fn is_critical_stock(&self) -> bool {
+        self.stock_percentage() <= 15
+    }
+}
diff --git a/backend/src/domain/mod.rs b/backend/src/domain/mod.rs
new file mode 100644
index 0000000..a4e2825
--- /dev/null
+++ b/backend/src/domain/mod.rs
@@ -0,0 +1,3 @@
+pub mod filament;
+pub mod spool_preset;
+pub mod user;
diff --git a/backend/src/domain/spool_preset.rs b/backend/src/domain/spool_preset.rs
new file mode 100644
index 0000000..deef234
--- /dev/null
+++ b/backend/src/domain/spool_preset.rs
@@ -0,0 +1,48 @@
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+/// Entidade de domínio que representa um preset de carretel.
+/// Presets do sistema têm `is_system = true` e `user_id = None`.
+/// Presets customizados têm `is_system = false` e `user_id = Some(uuid)`.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SpoolPreset {
+    pub id: Uuid,
+    pub name: String,
+    /// Peso do carretel vazio em gramas
+    pub spool_weight_g: i32,
+    /// true = preset built-in do sistema (somente leitura)
+    pub is_system: bool,
+    /// None para presets do sistema
+    pub user_id: Option<Uuid>,
+    pub created_at: OffsetDateTime,
+}
+
+impl SpoolPreset {
+    pub fn new_system(name: String, spool_weight_g: i32) -> Self {
+        Self {
+            id: Uuid::new_v4(),
+            name,
+            spool_weight_g,
+            is_system: true,
+            user_id: None,
+            created_at: OffsetDateTime::now_utc(),
+        }
+    }
+
+    pub fn new_custom(name: String, spool_weight_g: i32, user_id: Uuid) -> Self {
+        Self {
+            id: Uuid::new_v4(),
+            name,
+            spool_weight_g,
+            is_system: false,
+            user_id: Some(user_id),
+            created_at: OffsetDateTime::now_utc(),
+        }
+    }
+
+    /// Retorna true se o usuário informado pode editar ou deletar este preset.
+    pub fn is_editable_by(&self, user_id: Uuid) -> bool {
+        !self.is_system && self.user_id == Some(user_id)
+    }
+}
diff --git a/backend/src/domain/user.rs b/backend/src/domain/user.rs
new file mode 100644
index 0000000..448f926
--- /dev/null
+++ b/backend/src/domain/user.rs
@@ -0,0 +1,62 @@
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+/// Entidade de domínio que representa um usuário da plataforma.
+/// Esta struct não tem dependências de infraestrutura — apenas tipos base.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct User {
+    pub id: Uuid,
+    pub email: String,
+    /// Hash bcrypt/argon2. None quando o usuário usa OAuth exclusivamente.
+    pub password_hash: Option<String>,
+    /// ID do usuário no Google OAuth. None quando usa email/senha.
+    pub google_id: Option<String>,
+    pub email_verified: bool,
+    pub created_at: OffsetDateTime,
+    pub updated_at: OffsetDateTime,
+}
+
+/// Provedor de autenticação utilizado pelo usuário.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum AuthProvider {
+    EmailPassword,
+    Google,
+}
+
+impl User {
+    pub fn new_with_password(email: String, password_hash: String) -> Self {
+        let now = OffsetDateTime::now_utc();
+        Self {
+            id: Uuid::new_v4(),
+            email,
+            password_hash: Some(password_hash),
+            google_id: None,
+            email_verified: false,
+            created_at: now,
+            updated_at: now,
+        }
+    }
+
+    pub fn new_with_google(email: String, google_id: String) -> Self {
+        let now = OffsetDateTime::now_utc();
+        Self {
+            id: Uuid::new_v4(),
+            email,
+            password_hash: None,
+            google_id: Some(google_id),
+            email_verified: true,
+            created_at: now,
+            updated_at: now,
+        }
+    }
+
+    pub fn auth_provider(&self) -> AuthProvider {
+        if self.google_id.is_some() {
+            AuthProvider::Google
+        } else {
+            AuthProvider::EmailPassword
+        }
+    }
+}
diff --git a/backend/src/error.rs b/backend/src/error.rs
new file mode 100644
index 0000000..dc6b288
--- /dev/null
+++ b/backend/src/error.rs
@@ -0,0 +1,78 @@
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+    Json,
+};
+use serde_json::json;
+
+/// Erro centralizado da aplicação.
+/// Toda camada retorna `Result<T, AppError>`.
+#[derive(Debug, thiserror::Error)]
+pub enum AppError {
+    #[error("not found")]
+    NotFound,
+
+    #[error("unauthorized")]
+    Unauthorized,
+
+    #[error("forbidden")]
+    Forbidden,
+
+    #[error("validation error: {0}")]
+    Validation(String),
+
+    #[error("conflict: {0}")]
+    Conflict(String),
+
+    #[error("unprocessable entity: {0}")]
+    UnprocessableEntity(String),
+
+    #[error("internal error")]
+    Internal(#[from] anyhow::Error),
+}
+
+impl AppError {
+    fn status_and_code(&self) -> (StatusCode, &'static str) {
+        match self {
+            Self::NotFound => (StatusCode::NOT_FOUND, "NOT_FOUND"),
+            Self::Unauthorized => (StatusCode::UNAUTHORIZED, "UNAUTHORIZED"),
+            Self::Forbidden => (StatusCode::FORBIDDEN, "FORBIDDEN"),
+            Self::Validation(_) => (StatusCode::BAD_REQUEST, "VALIDATION_ERROR"),
+            Self::Conflict(_) => (StatusCode::CONFLICT, "CONFLICT"),
+            Self::UnprocessableEntity(_) => (StatusCode::UNPROCESSABLE_ENTITY, "UNPROCESSABLE_ENTITY"),
+            Self::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "INTERNAL_ERROR"),
+        }
+    }
+}
+
+impl IntoResponse for AppError {
+    fn into_response(self) -> Response {
+        let (status, code) = self.status_and_code();
+
+        if status == StatusCode::INTERNAL_SERVER_ERROR {
+            tracing::error!(error = %self, "Internal server error");
+        }
+
+        let body = Json(json!({
+            "error": self.to_string(),
+            "code": code,
+        }));
+
+        (status, body).into_response()
+    }
+}
+
+impl From<sqlx::Error> for AppError {
+    fn from(err: sqlx::Error) -> Self {
+        match err {
+            sqlx::Error::RowNotFound => Self::NotFound,
+            _ => Self::Internal(err.into()),
+        }
+    }
+}
+
+impl From<validator::ValidationErrors> for AppError {
+    fn from(err: validator::ValidationErrors) -> Self {
+        Self::Validation(err.to_string())
+    }
+}
diff --git a/backend/src/main.rs b/backend/src/main.rs
new file mode 100644
index 0000000..355fd29
--- /dev/null
+++ b/backend/src/main.rs
@@ -0,0 +1,43 @@
+use dotenvy::dotenv;
+use sqlx::postgres::PgPoolOptions;
+use std::net::SocketAddr;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilter};
+
+mod adapters;
+mod application;
+mod config;
+mod domain;
+mod error;
+mod ports;
+mod router;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    dotenv().ok();
+
+    tracing_subscriber::registry()
+        .with(EnvFilter::try_from_default_env().unwrap_or_else(|_| "meowspool=debug,tower_http=debug".into()))
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let config = config::Config::from_env()?;
+
+    tracing::info!("Connecting to database...");
+    let db_pool = PgPoolOptions::new()
+        .max_connections(10)
+        .connect(&config.database_url)
+        .await?;
+
+    tracing::info!("Running migrations...");
+    sqlx::migrate!("./migrations").run(&db_pool).await?;
+
+    let app = router::build(db_pool, config.clone());
+
+    let addr: SocketAddr = format!("{}:{}", config.host, config.port).parse()?;
+    tracing::info!("Server listening on {}", addr);
+
+    let listener = tokio::net::TcpListener::bind(addr).await?;
+    axum::serve(listener, app).await?;
+
+    Ok(())
+}
diff --git a/backend/src/ports/filament_repository.rs b/backend/src/ports/filament_repository.rs
new file mode 100644
index 0000000..8e610ed
--- /dev/null
+++ b/backend/src/ports/filament_repository.rs
@@ -0,0 +1,43 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use crate::{domain::filament::Filament, error::AppError};
+
+/// Filtros disponíveis para listagem de filamentos.
+#[derive(Debug, Default, Clone)]
+pub struct FilamentFilter {
+    pub material: Option<String>,
+    pub brand: Option<String>,
+    /// Busca full-text em marca, modelo e notas
+    pub search: Option<String>,
+    /// "low" (<=15%), "medium" (<=35%), "ok" (>35%)
+    pub stock_level: Option<String>,
+    pub sort: Option<SortOrder>,
+    pub page: u32,
+    pub per_page: u32,
+}
+
+#[derive(Debug, Clone)]
+pub enum SortOrder {
+    NetWeightAsc,
+    NetWeightDesc,
+    CreatedAtDesc,
+}
+
+/// Port (interface) para operações de persistência de filamentos.
+/// Implementado pelo adapter `PostgresFilamentRepository`.
+#[async_trait]
+pub trait FilamentRepository: Send + Sync {
+    /// Busca um filamento pelo ID, garantindo que pertence ao user_id informado.
+    async fn find_by_id(&self, id: Uuid, user_id: Uuid) -> Result<Option<Filament>, AppError>;
+
+    /// Lista filamentos do usuário com filtros e paginação.
+    async fn list(&self, user_id: Uuid, filter: FilamentFilter) -> Result<Vec<Filament>, AppError>;
+
+    /// Conta o total de filamentos (para paginação).
+    async fn count(&self, user_id: Uuid, filter: &FilamentFilter) -> Result<i64, AppError>;
+
+    async fn create(&self, filament: &Filament) -> Result<Filament, AppError>;
+    async fn update(&self, filament: &Filament) -> Result<Filament, AppError>;
+    async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError>;
+}
diff --git a/backend/src/ports/mod.rs b/backend/src/ports/mod.rs
new file mode 100644
index 0000000..2b6a8df
--- /dev/null
+++ b/backend/src/ports/mod.rs
@@ -0,0 +1,7 @@
+pub mod filament_repository;
+pub mod spool_preset_repository;
+pub mod user_repository;
+
+pub use filament_repository::{FilamentFilter, FilamentRepository};
+pub use spool_preset_repository::SpoolPresetRepository;
+pub use user_repository::UserRepository;
diff --git a/backend/src/ports/spool_preset_repository.rs b/backend/src/ports/spool_preset_repository.rs
new file mode 100644
index 0000000..d74040b
--- /dev/null
+++ b/backend/src/ports/spool_preset_repository.rs
@@ -0,0 +1,18 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use crate::{domain::spool_preset::SpoolPreset, error::AppError};
+
+/// Port (interface) para operações de persistência de presets de carretel.
+/// Implementado pelo adapter `PostgresSpoolPresetRepository`.
+#[async_trait]
+pub trait SpoolPresetRepository: Send + Sync {
+    /// Retorna todos os presets do sistema mais os presets customizados do usuário.
+    async fn list_for_user(&self, user_id: Uuid) -> Result<Vec<SpoolPreset>, AppError>;
+
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<SpoolPreset>, AppError>;
+
+    async fn create(&self, preset: &SpoolPreset) -> Result<SpoolPreset, AppError>;
+    async fn update(&self, preset: &SpoolPreset) -> Result<SpoolPreset, AppError>;
+    async fn delete(&self, id: Uuid, user_id: Uuid) -> Result<(), AppError>;
+}
diff --git a/backend/src/ports/user_repository.rs b/backend/src/ports/user_repository.rs
new file mode 100644
index 0000000..a2597c1
--- /dev/null
+++ b/backend/src/ports/user_repository.rs
@@ -0,0 +1,16 @@
+use async_trait::async_trait;
+use uuid::Uuid;
+
+use crate::{domain::user::User, error::AppError};
+
+/// Port (interface) para operações de persistência de usuários.
+/// Implementado pelo adapter `PostgresUserRepository`.
+#[async_trait]
+pub trait UserRepository: Send + Sync {
+    async fn find_by_id(&self, id: Uuid) -> Result<Option<User>, AppError>;
+    async fn find_by_email(&self, email: &str) -> Result<Option<User>, AppError>;
+    async fn find_by_google_id(&self, google_id: &str) -> Result<Option<User>, AppError>;
+    async fn create(&self, user: &User) -> Result<User, AppError>;
+    async fn update(&self, user: &User) -> Result<User, AppError>;
+    async fn verify_email(&self, id: Uuid) -> Result<(), AppError>;
+}
diff --git a/backend/src/router.rs b/backend/src/router.rs
new file mode 100644
index 0000000..293cb78
--- /dev/null
+++ b/backend/src/router.rs
@@ -0,0 +1,100 @@
+use axum::{middleware, routing::{delete, get, post, put}, Router};
+use sqlx::PgPool;
+use std::sync::Arc;
+use tower_http::{cors::CorsLayer, trace::TraceLayer};
+
+use crate::{
+    adapters::{
+        inbound::{
+            auth_handler,
+            filament_handler,
+            spool_preset_handler,
+            user_handler,
+            middleware::auth::auth_middleware,
+        },
+        outbound::{
+            PostgresFilamentRepository,
+            PostgresSpoolPresetRepository,
+            PostgresUserRepository,
+        },
+    },
+    application::{AuthService, FilamentService, SpoolPresetService},
+    config::Config,
+    ports::{FilamentRepository, SpoolPresetRepository, UserRepository},
+};
+
+/// Estado compartilhado injetado em todos os handlers via Axum State.
+#[derive(Clone)]
+pub struct AppState {
+    pub auth_service: Arc<AuthService>,
+    pub filament_service: Arc<FilamentService>,
+    pub spool_preset_service: Arc<SpoolPresetService>,
+    pub config: Config,
+}
+
+/// Constrói o router Axum com todas as rotas e middlewares.
+pub fn build(db: PgPool, config: Config) -> Router {
+    let db = Arc::new(db);
+
+    // Repositórios (outbound adapters)
+    let user_repo: Arc<dyn UserRepository> = Arc::new(PostgresUserRepository::new(Arc::clone(&db)));
+    let filament_repo: Arc<dyn FilamentRepository> = Arc::new(PostgresFilamentRepository::new(Arc::clone(&db)));
+    let preset_repo: Arc<dyn SpoolPresetRepository> = Arc::new(PostgresSpoolPresetRepository::new(Arc::clone(&db)));
+
+    // Serviços (application layer)
+    let auth_service = Arc::new(AuthService::new(
+        Arc::clone(&user_repo),
+        config.clone(),
+    ));
+    let filament_service = Arc::new(FilamentService::new(
+        Arc::clone(&filament_repo),
+        Arc::clone(&preset_repo),
+    ));
+    let spool_preset_service = Arc::new(SpoolPresetService::new(Arc::clone(&preset_repo)));
+
+    let state = AppState {
+        auth_service,
+        filament_service,
+        spool_preset_service,
+        config: config.clone(),
+    };
+
+    // Rotas públicas (sem autenticação)
+    let public_routes = Router::new()
+        .route("/auth/register", post(auth_handler::register_handler))
+        .route("/auth/login", post(auth_handler::login_handler))
+        .route("/auth/oauth/google", post(auth_handler::google_oauth_handler))
+        .route("/auth/refresh", post(auth_handler::refresh_token_handler))
+        .route("/auth/forgot-password", post(auth_handler::forgot_password_handler))
+        .route("/auth/verify-email", post(auth_handler::verify_email_handler))
+        .route("/auth/reset-password", post(auth_handler::reset_password_handler));
+
+    // Rotas protegidas (requerem JWT válido)
+    let protected_routes = Router::new()
+        .route("/auth/logout", post(auth_handler::logout_handler))
+        // Users
+        .route("/users/me", get(user_handler::get_me_handler))
+        .route("/users/me", put(user_handler::update_me_handler))
+        // Dashboard
+        .route("/dashboard", get(filament_handler::dashboard_handler))
+        // Filaments
+        .route("/filaments", get(filament_handler::list_filaments_handler))
+        .route("/filaments", post(filament_handler::create_filament_handler))
+        .route("/filaments/:id", get(filament_handler::get_filament_handler))
+        .route("/filaments/:id", put(filament_handler::update_filament_handler))
+        .route("/filaments/:id", delete(filament_handler::delete_filament_handler))
+        .route("/filaments/:id/qrcode", get(filament_handler::get_qrcode_handler))
+        .route("/filaments/:id/label.svg", get(filament_handler::export_label_handler))
+        // Spool Presets
+        .route("/spool-presets", get(spool_preset_handler::list_presets_handler))
+        .route("/spool-presets", post(spool_preset_handler::create_preset_handler))
+        .route("/spool-presets/:id", put(spool_preset_handler::update_preset_handler))
+        .route("/spool-presets/:id", delete(spool_preset_handler::delete_preset_handler))
+        .route_layer(middleware::from_fn_with_state(state.clone(), auth_middleware));
+
+    Router::new()
+        .nest("/api/v1", public_routes.merge(protected_routes))
+        .with_state(state)
+        .layer(TraceLayer::new_for_http())
+        .layer(CorsLayer::permissive())
+}