1. Define Domain Models: Create immutable Dart classes representing the core data structures.
2. Implement Services: Create stateless Service classes to handle raw data fetching.
3. Implement Repositories: Create Repository classes that consume the Services, handle caching, and return Domain Models.
4. Implement ViewModels: Create ViewModels that consume the Repositories. Expose immutable state and define methods for user actions.
5. Implement Views: Create Flutter Widgets that bind to the ViewModel state and trigger ViewModel methods on user interaction.
6. Run Validator: Execute unit tests for Services, Repositories, and ViewModels. Execute widget tests for Views.