How do you design a Clean Architecture-based Xamarin application and why is it important?

Clean Architecture in Xamarin separates UI, business logic, and data layers to improve testability, scalability, and maintainability.

Clean Architecture enforces strict separation of concerns by dividing the app into layers: Presentation (Xamarin.Forms UI + ViewModels), Domain (business rules and use cases), and Data (API, database, external services). The dependency rule ensures inner layers do not depend on outer layers. This makes the system highly testable and independent of frameworks like Xamarin.Forms or APIs. Changes in UI or data sources do not affect core business logic.