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# backend-engineering-playbook
Deliver backend changes that are predictable, testable, and production-safe.
## Default Stack (Unless User Overrides)
- Python 3.10+
- FastAPI
- Pydantic v2
- SQLAlchemy + Alembic
- uv + ruff + pytest
## Workflow
1. Confirm scope, API contract, and assumptions.
2. Design by layers: API -> service -> repository -> domain.
3. Keep handlers thin and push business logic into services.
4. Implement explicit validation, error handling, and transaction boundaries.
5. Add or update tests for happy path and edge cases.
6. Run verification before completion claim.
## Verification
```bash
uv run ruff check .
uv run ruff format --check .
uv run pytest
```
