flutter-feature-based-clean-architecture

Structure Flutter clean architecture by encapsulating each feature under lib/features with a 3-layer structure: domain, data, and presentation. This isolates concerns and maintains a strict separation where presentation depends on domain and data depends on domain.

The best way to organize scalable Flutter projects is keeping lib/features flat to prevent unnecessary nesting. Export domain boundaries via a single feature root API to enforce modularity and prevent ad-hoc folder structures across the application.

Features cannot import cross-feature presentation or data layers in this architecture. Features may depend only on the Domain layer of other features to preserve strict boundaries and ensure feature encapsulation across the application.

Mappers and shared logic belong in lib/shared or lib/core directories. This prevents leaking DTOs into the UI layer and isolates cross-cutting concerns from the feature-specific domain, data, and presentation layers.

Refactor into feature-based architecture when facing ad-hoc folder structures and unclear boundaries between layers. Apply these standards when creating new features or refactoring existing ones under lib/features to maintain scalable Flutter architecture.