What architectural approaches do you consider most effective?

The most effective architectural approaches in Flutter typically include:

• MVVM (Model-View-ViewModel) — separates logic and UI, making testing and maintenance easier.
• BLoC (Business Logic Component) — uses streams to manage state, well-suited for reactive programming.
• Provider — a simple and popular way to manage state with minimal boilerplate.

The choice depends on the complexity of the application and the team, but BLoC and Provider are often recommended for scalable projects.