Mobile Front-End Developer interview questions

React Native is a framework created by Facebook that uses JavaScript to build mobile apps, whereas Flutter, developed by Google, uses Dart language. React Native relies on native components for rendering, while Flutter uses its own rendering engine and approach for creating UI components.

Performance optimization can be achieved by minimizing JavaScript application size, leveraging efficient image loading and caching strategies, using virtualization for large lists, and ensuring smooth animations and transitions.

State management can be handled using libraries like Redux, MobX, or Context API for React Native applications, and Provider or Riverpod for Flutter apps. These tools help efficiently manage app state across different components.

Responsive Design is implemented by using flexible layouts, media queries, and scalable vector graphics to ensure the app looks good on various screen sizes and orientations. Tools like Flexbox or Grid can be very useful for creating responsive layouts.

I follow tech blogs, participate in developer communities like Stack Overflow or Reddit, attend conferences and webinars, and contribute to open-source projects. Staying active in the developer community helps me stay up-to-date with the latest trends.

Accessibility can be achieved by using semantic elements, providing text alternatives for images, ensuring sufficient color contrast, enabling screen-reader compatibility, and implementing touch targets that are large enough to minimize mis-taps.

One challenging issue was an app with slow navigation due to heavy component rendering. I solved it by optimizing lazy loading for screen components and using memoization to prevent unnecessary re-renders, which drastically enhanced performance.

I primarily use Git for version control, employing branching strategies like Git Flow or feature branches to manage changes effectively, collaborate with team members through pull requests, and maintain a clean release history.

I implement push notifications using services like Firebase Cloud Messaging for both Android and iOS. This involves setting up a notification service, handling notification data payloads, and providing in-app handling logic to ensure user engagement.

When integrating third-party libraries, I ensure that they are well-documented, have a large community for support, and are actively maintained. I also evaluate their impact on app performance and security.