Why I Build with FastAPI
FastAPI is my primary framework for backend systems where correctness and performance both matter. The async-first model fits naturally into the kind of architectures I build — event-driven integrations, multi-tenant platforms, APIs serving both web and mobile clients simultaneously.
What keeps me coming back isn't raw speed. It's predictability: Pydantic-enforced contracts at every boundary mean data shape issues surface at validation time, not in production logs.
What This Looks Like in Practice
Async I/O without complexity — asyncio handles concurrent connections without thread-per-request overhead. In high-traffic integration layers (like Shopify webhook processing in Allydium), this means the system stays responsive under load spikes without over-provisioning.
Strict data contracts with Pydantic — every input and output is typed and validated at the boundary. This is especially important in multi-role B2B platforms where the same endpoint serves different access levels, and silent data corruption isn't an option.
Auto-generated OpenAPI docs — the schema stays in sync with the code by definition. In projects with separate frontend and mobile teams, this eliminates the "docs are outdated" class of integration bugs.
Where I Use It
- High-load integration layers that absorb external event traffic (e-commerce, webhooks, third-party APIs)
- B2B SaaS backends with complex role hierarchies and access control
- Booking and scheduling systems with real-time availability logic
- Internal admin APIs and dashboard backends