Every full-stack tutorial ends the same way: a working app, a happy demo, and zero mention of what happens six months later when your "simple" CRUD app has 40 endpoints, three types of caching, and a frontend team that's afraid to touch the API layer.
This post isn't about picking a framework. It's about the architectural decisions that quietly determine whether your app is pleasant to work on in year two — or a slow-motion disaster.
1. Stop treating your API layer as an afterthought
A huge number of full-stack apps start with the frontend calling the backend directly, endpoint by endpoint, with no shared contract. It works fine at 5 endpoints. At 50, nobody remembers which fields are optional, which ones changed last sprint, or why the mobile app is still sending the old shape.
Two things fix this early:
