.Net Maui Interview Guide for Basic, Intermediate and Advanced Questions

If you are preparing for an interview focused on .NET MAUI (Multiplatform App UI), here are some important topics and questions that could come up. .NET MAUI is a cross-platform framework for building native mobile and desktop apps with .NET, so a lot of questions will center on its features, architecture, and how it compares to other frameworks like Xamarin.Forms.

Basic Questions

1. What is .NET MAUI?
   • Discuss how .NET MAUI enables cross-platform development for iOS, Android, Windows, and macOS within a single codebase and how it extends Xamarin.Forms.
2. How does .NET MAUI compare to Xamarin.Forms?
   • Highlight improvements in MAUI, such as a single project structure, multi-targeting, and enhanced performance and platform integrations.
3. What is the single project structure in .NET MAUI, and why is it beneficial?
   • Explain how .NET MAUI’s single project structure simplifies development by consolidating resources, dependencies, and configurations for all target platforms.
4. What platforms are supported by .NET MAUI?
   • iOS, Android, macOS, and Windows (using WinUI).
5. Explain the role of handlers in .NET MAUI.
   • Handlers replace renderers from Xamarin.Forms, offering a more flexible and performant way to handle cross-platform UI elements.

Intermediate Questions

6. Describe the lifecycle of a .NET MAUI application.
   • Outline key events, from initialization to lifecycle events for mobile (OnStart, OnResume, OnSleep) and desktop (Windows lifecycle).
7. How does .NET MAUI handle platform-specific code?
   • Talk about the use of partial classes, dependency services, and platform-specific APIs.
8. What is MVVM, and why is it commonly used in .NET MAUI?
   • Explain the Model-View-ViewModel pattern and its advantages for separation of concerns and testability in UI applications.
9. How do you manage dependencies in .NET MAUI?
   • Mention dependency injection, which is natively supported by .NET MAUI, and how it can be used to manage services and repositories.
10. How does .NET MAUI handle layouts and responsive design?
    • Discuss layouts (StackLayout, Grid, FlexLayout) and how they can be used to create responsive designs that adapt to different screen sizes.

Advanced Questions

11. What are some ways to optimize performance in .NET MAUI apps?
    • Describe techniques like lazy loading, caching, minimizing resource usage, and using native controls only when necessary.
12. How does Blazor integrate with .NET MAUI?
    • Explain the hybrid approach where Blazor components can be used within a .NET MAUI app, allowing developers to reuse web components.
13. What are the differences between Shell and traditional navigation in .NET MAUI?
    • Outline how Shell simplifies complex navigation stacks and offers a unified navigation experience, especially for mobile apps.
14. How does .NET MAUI handle device-specific resources like images or fonts?
    • Describe how .NET MAUI allows you to define resources for specific platforms in a central location, with platform-specific folders.
15. Explain the role of Dependency Services in .NET MAUI.
    • Describe how to use DependencyService to call platform-specific code or services, like device sensors.

Scenario-Based Questions

16. How would you implement offline data storage in a .NET MAUI app?
    • Discuss options like SQLite, Realm, or a local JSON file, and how to manage data synchronization when connectivity is restored.
17. How would you implement authentication in a .NET MAUI app?
    • Describe possible approaches, such as OAuth, JWT, or integrating with platforms like Firebase or Azure AD B2C.
18. What approach would you use to consume RESTful APIs in .NET MAUI?
    • Talk about using HttpClient, deserialization with libraries like Newtonsoft.Json or System.Text.Json, and handling asynchronous calls.
19. How would you handle push notifications in a .NET MAUI app?
    • Explain how to integrate Firebase Cloud Messaging (FCM) for Android and APNs for iOS, and possibly use a library like App Center for simplified integration.
20. What strategies would you use for app debugging and diagnostics in .NET MAUI?
    • Mention tools like Visual Studio diagnostic tools, breakpoints, the MAUI-specific Hot Reload feature, and third-party services like App Center for crash reporting.

Behavioral/Experience-Based Questions

21. Can you share an example of a challenging bug you encountered with MAUI and how you solved it?
    • Highlight any specific troubleshooting skills or methods you used, like examining the stack trace, isolating the issue, or checking platform-specific dependencies.
22. Describe a project where you had to ensure cross-platform compatibility. How did you address platform-specific challenges?
    • Share your approach to testing on multiple platforms and handling unique behaviors or limitations.
23. What practices do you follow for making your .NET MAUI code maintainable and scalable?
    • Explain your practices around code organization, naming conventions, use of MVVM, and creating reusable components.

Preparing with these questions and familiarizing yourself with .NET MAUI’s documentation will strengthen your understanding and help you navigate various technical topics during your interview.