Lessons Learned using FastAPI in the Wild

Graham Lyons

This talk is for anyone curious about what it’s like to run FastAPI in production. An asynchronous web framework with automatically generated documentation and dependency injection, FastAPI has made huge gains in popularity and overtook Flask in the 2025 Stack Overflow Annual Developer Survey. FastAPI’s features are impressive and picking it up is easy, but beyond that what is it really like to run in production? What joys and pitfalls await those deploying the most popular Python web framework?