3 FastAPI patterns I use in every project

After building enough backends, you stop rewriting the same stuff.

Here are 3 FastAPI patterns I now use by default:

1. Pydantic schemas for everything
   No more guessing what an endpoint expects. Request → model → validation → done.

2. Dependency injection for DB sessions
   One place to open, one place to close. No leaking connections. No random errors.

3. Background tasks for anything slow
   Sending emails? Generating reports? Calling an LLM? Don't make the user wait. Fire and forget.

Nothing fancy. Just boring, reliable patterns that save me from 2 AM debugging.

What's one pattern you never skip?