All 7 Flutter App Architecture with Modular Feature Folders questions
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What does organizing a Flutter project using a feature based folder structure actually mean, and how does it differ from the more common default approach of organizing files strictly by their specific type? Why does a small, simple Flutter app often not actually need a genuinely complex, formal architecture, and at what specific point does adopting a more structured approach typically start to become genuinely worthwhile? How should shared code, such as common reusable widgets, utility functions, and core services, be organized within a feature based folder structure, given that this kind of code is not genuinely specific to just one single individual feature? How does a well organized modular feature folder structure specifically make it genuinely easier for multiple different developers to work simultaneously on entirely separate features without frequently causing disruptive merge conflicts with each other? How can a large Flutter application be split into genuinely separate internal packages, one for each major feature, using a monorepo approach, rather than simply keeping everything within just folders inside a single unified app? How should an architecture properly enforce module boundaries between different features, ensuring one feature genuinely does not develop an unwanted, tightly coupled direct dependency on another entirely separate feature's own specific internal implementation details?
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How can a feature based folder structure be further organized internally using distinct architectural layers, such as separating presentation, domain, and data code within each individual feature?

Intermediate

Answer

Within each individual feature specific folder, you can further organize files into distinct architectural layers, typically including a presentation layer containing the actual screens and widgets, a domain layer containing the core genuine business logic and abstract data models, and a data layer containing the specific repository implementations actually responsible for fetching and persisting data, and combining this specific layered internal organization together with an overall feature based structure gives you the meaningful, genuine benefits of both approaches, keeping related feature specific code conveniently grouped together while still maintaining a clear, sensible separation of distinct architectural concerns within each individual feature.
lib/
  features/
    checkout/
      presentation/
      domain/
      data/
Real-world example A checkout feature organizes its own internal code into separate presentation, domain, and data layers, letting a developer immediately and easily locate exactly where the actual checkout business logic lives, clearly separate from its specific user interface code and its data fetching implementation details.

Common follow-ups: How strictly should dependencies between these different internal layers actually be enforced?;Does every single feature genuinely need this full layered structure, or is it sometimes reasonably acceptable to simplify it for a smaller feature?

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