How do you handle complex state management (BLoC/Riverpod) at scale?

At scale, state management requires strict separation of concerns, unidirectional data flow, and testability.

Using BLoC (Business Logic Component), UI components send Events to the BLoC. The BLoC processes business logic, communicates with repositories, and yields new States. Riverpod offers similar separation using Providers but ensures compile-time safety and dependency injection without coupling to the Widget tree. Both enable scalable, predictable, and highly testable architectures.