Every React Native codebase I've worked on hits the same wall around month four. A screen that started at 80 lines is now 400. Half of it is useEffect chains coordinating API calls. A push notification mid-flow leaves the app in a state nobody can reproduce. Clean architecture in React Native isn't about folders or layers. It's about whether you can still reason about your app when async, navigation, and native modules collide. The shape that fails The default React Native architecture is "everything lives where it's first needed." API calls land in the handler that triggers them. State sits in the screen that displays it. Native modules get called from the button that activates them. It works for the first month. What it doesn't survive: Async outliving its caller. A user kicks off a request, taps a notification, lands on a different screen. The original promise resolves into a setter that no longer makes sense. Native modules in the UI. A screen calls NativeModules.Audio.start() directly.…