All 7 Flutter Architecture Patterns (MVVM & Clean Architecture) questions
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What is Clean Architecture, and what are its three commonly referenced core layers, presentation, domain, and data? How do use cases, sometimes also called interactors, in Clean Architecture help encapsulate one single specific piece of application business logic, keeping it fully independent of any specific user interface or specific data source implementation? How does the repository pattern abstract away the specific technical details of exactly where data actually comes from, such as a remote API versus a local cache, from the rest of an app's business logic? How does properly separating business logic from a specific state management library, such as Provider or BLoC, help make that business logic genuinely reusable and considerably easier to test, regardless of which particular library you might actually choose to use? How do you properly test each individual distinct layer of a Clean Architecture based Flutter app, including the domain, data, and presentation layers, using genuinely appropriate distinct testing strategies for each one?
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What are the practical tradeoffs of adopting a genuinely full, strict Clean Architecture approach for a Flutter app, in terms of both the additional required boilerplate code and the genuine long term maintainability benefits it actually provides?

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Adopting a genuinely full, strict Clean Architecture approach typically requires noticeably more upfront boilerplate code, such as defining separate abstract repository interfaces, individual dedicated use case classes, and distinct data models for each of the separate presentation, domain, and data layers, which can meaningfully slow down initial development for a smaller or simpler application, but this same additional upfront structure generally pays off considerably as an application's genuine complexity and overall codebase size grow substantially over time, since the resulting clear separation of distinct concerns makes the codebase considerably easier to test thoroughly, to onboard new developers into effectively, and to safely and confidently modify without unintentionally introducing new far reaching, unexpected bugs elsewhere.
// Full Clean Architecture: significantly more files, but clearer separation
// domain/entities/order.dart
// domain/repositories/order_repository.dart
// domain/usecases/place_order_usecase.dart
// data/repositories/order_repository_impl.dart
Real-world example A startup building an early stage minimum viable product deliberately chooses a considerably lighter weight architecture initially to genuinely maximize their development speed, explicitly planning to properly adopt a more full, strict Clean Architecture approach only later, once their product has actually found genuine, sustained market traction.

Common follow-ups: How do you properly decide on an appropriate level of architectural strictness for a specific given project's actual needs?;Can a Flutter app reasonably adopt some, but genuinely not all, of Clean Architecture's core principles?

Flutter App Architecture with Modular Feature Folders;Dependency Injection in Flutter (GetIt & Service Locator)
All 7 Flutter Architecture Patterns (MVVM & Clean Architecture) questions