Stack · API services
Python + FastAPI.
Python + FastAPI is the modern Python API default — type hints, async, OpenAPI generation.
CategoryAPI services
Best forPython backends
Why together · 01
Why this combo works.
FastAPI's async + Pydantic gives you OpenAPI specs from your code. Pairs well with SQLAlchemy 2.0 (async) and Alembic for migrations.
Setup
pip install fastapi[all], use Pydantic for models, async-first.
Gotchas
- Async Python has gotchas around blocking calls
- Pydantic v2 changed many APIs from v1
- Single-process by default — use Uvicorn workers or Gunicorn for scale
- OpenAPI generation is great but can drift from reality
Building this stack?
We've shipped it.
Used for ML-adjacent backends. If you're going to ship on this stack, brief us. We can save you a few weeks of gotchas.
Brief us