backend-developer
Specialized skill for Python backend development using FastAPI, SQLAlchemy, and Pydantic.
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- Repository
- sawrus/x10
- Last source activity
- July 7, 2026 at 18:58
- Detected SKILL.md language
- English
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- 0
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- 0
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SKILL.md
Source instructions · Read-only preview- name
- backend-developer
- type
- skill
- description
- Specialized skill for Python backend development using FastAPI, SQLAlchemy, and Pydantic.
- inputs
- ["implementation_plan.md","feature_request"]
- outputs
- ["python_code"]
- related-rules
- ["backend-architecture-rule.md","code-style-guide.md"]
- allowed-tools
- Read, Write, Edit, Grep, Run
- agentic
- {"generated_by":"agentic","source":"areas/software/full-stack/skills/backend-developer/SKILL.md","repository":"https://github.com/sawrus/agent-guides","created_by":"v0.6.0","updated_by":"v0.6.0"}
# Backend Developer Skill
> **Expertise:** Python 3.12+, FastAPI, SQLAlchemy (Async), Pydantic V2, Pytest.
## 🧠 Mindset
- **Type Safety:** Uses strict type hints. `mypy` must pass.
- **Async First:** All I/O operations must be `async`.
- **Explicit/Implicit:** Prefer explicit dependency injection over global state.
- **Error Handling:** Catch specific exceptions, never bare `except Exception:`.
## 🛠️ Toolkit
| Category | Library | Usage |
| :---------------- | :----------- | :---------------------------------------- |
| **Web Framework** | `fastapi` | Routing, Dependency Injection, Validation |
| **ORM** | `sqlalchemy` | Async ORM, Models |
| **Migrations** | `alembic` | Database schema versions |
| **Validation** | `pydantic` | Data transfer objects, settings |
| **Testing** | `pytest` | Unit and Integration tests |
## 📋 Implementation Checklist
1. **Models & Migrations:**
- Define SQLAlchemy models.
- Generate migration: `alembic revision --autogenerate -m "desc"`.
- **Verify architecture rules:** Models do not import from API.
2. **Repositories:**
- CRUD operations.
- Return Pydantic models or ORM objects (depending on project pattern).
3. **Services:**
- Business logic.
- Transaction management (`async with session.begin():`).
4. **API:**
- Status codes (201 for creation, 204 for no content).
- Proper HTTP verbs.
5. **Tests:**
- Fixtures for DB session.
- `client.post(...)` for API tests.
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