Vercel is exceptional for frontend. But somewhere along the way, Python developers started asking: can I deploy my FastAPI, Django, or Flask app here too? The answer from Vercel is technically yes. The answer from developers who tried it is more complicated. Vercel does support Python via its serverless runtime. For simple, stateless API endpoints, it works. But the moment your Python backend needs persistent processes, background tasks, WebSockets, or runs longer than 60 seconds, you start fighting the platform instead of building your product. This post covers exactly what happens when you try to run a real Python backend on Vercel, where it breaks, and what developers are using instead in 2026. How Vercel Actually Runs Python Before diving into the problems, it helps to understand the architecture. Vercel runs Python through Vercel Functions, a serverless execution model based on ASGI (Asynchronous Server Gateway Interface) and WSGI (Web Server Gateway Interface).…