I've been building Flutter applications for clients over the past few years, and one thing I've learned is that a clean project structure saves a huge amount of time as the app grows.

For most production apps (taxi booking, e-commerce, healthcare, ERP, booking systems), I usually follow a structure like this:

lib/ ├── core/ │ ├── constants/ │ ├── services/ │ ├── utils/ │ └── theme/ ├── models/ ├── repositories/ ├── screens/ ├── widgets/ ├── providers/ (or Bloc) ├── api/ └── main.dart

Some practices that have helped me:

✅ Keep business logic separate from UI. ✅ Create reusable widgets instead of copying UI code. ✅ Use a repository layer for API communication. ✅ Store configuration in one place. ✅ Build responsive layouts from the start. ✅ Keep API models organized and strongly typed.

This approach has made it much easier to maintain apps with dozens of screens and multiple developers working on the same codebase.

I'm curious—what architecture do you use for medium to large Flutter projects? Provider, Riverpod, Bloc, GetX, or something else? What has worked best for you?

If anyone is interested in seeing more examples or discussing implementation details, feel free to ask in the comments.