Flutter Interview Questions Part 5: Architecture & Design Patterns

Welcome to Part 5 of the Flutter Interview Questions series! This part focuses on the architectural foundations that separate hobby projects from production-grade Flutter applications. We cover Clean Architecture, MVVM, the Repository pattern, Dependency Injection with get_it and injectable, SOLID principles with Flutter-specific examples, and classic Design Patterns such as Singleton, Factory, Observer, Builder, Strategy, Decorator, Adapter, and Command -- all applied in a Flutter context. This is part 5 of a 14-part series, so bookmark it and come back as you level up your preparation. What's in this part? Clean Architecture -- layers, folder structure, Use Cases, Entity vs Model, error handling, caching, testing MVVM -- Model-View-ViewModel in Flutter, data binding, navigation, state sharing Repository Pattern -- offline-first, pagination, Stream vs Future, DataSource vs Repository Dependency Injection -- get_it, injectable, environment-specific DI, scopes SOLID Principles -- each p