Google Firebase Interview Questions and Answers for 7 years experience

1. What are the core services offered by Firebase?

   • Answer: Firebase offers a suite of integrated services, including Realtime Database, Cloud Firestore, Cloud Storage, Authentication, Cloud Functions, Cloud Messaging, Hosting, and more. These services are designed to help developers build and scale high-quality apps quickly.

2. Explain the difference between Realtime Database and Cloud Firestore.

   • Answer: Realtime Database is a NoSQL, JSON-based database with automatic data synchronization. Firestore is also a NoSQL database but offers more flexible schema design, better scalability, and advanced features like transactions and offline capabilities. Firestore is generally preferred for larger, more complex applications.

3. How do you handle offline capabilities in Firebase?

   • Answer: Cloud Firestore offers built-in offline capabilities. Data is cached locally, allowing users to continue interacting with the app even without an internet connection. Changes are synchronized when connectivity is restored. Realtime Database offers limited offline functionality depending on the client library used.

4. Describe your experience with Firebase Authentication. What methods have you used?

   • Answer: I have extensive experience with Firebase Authentication, utilizing methods such as email/password, phone authentication, Google Sign-In, Facebook Login, Twitter Login, and custom authentication. I understand the importance of secure authentication and have implemented best practices to protect user data.

5. How do you secure your Firebase project?

   • Answer: Firebase security is paramount. I utilize Firebase Security Rules to define granular access control for both Realtime Database and Cloud Firestore. This involves carefully crafting rules to restrict data access based on user authentication and other relevant conditions. I also use strong passwords and regularly update my project's dependencies.

6. Explain your experience with Firebase Cloud Functions. Give an example.

   • Answer: I've extensively used Cloud Functions to handle server-side logic, such as processing data, sending notifications, and integrating with other services. For example, I've created functions triggered by database updates to send email notifications to users or perform background tasks. I'm familiar with different function types (HTTP, background) and deploying them efficiently.

7. How do you handle data synchronization in a collaborative application using Firebase?

   • Answer: I utilize Realtime Database or Cloud Firestore's real-time capabilities. By leveraging listeners and appropriate data structures, I ensure that all clients receive updates as data changes, maintaining consistency across multiple users. I also consider techniques like optimistic updates and conflict resolution to manage concurrent modifications.

8. How does Firebase Cloud Messaging (FCM) work?

   • Answer: FCM is a cross-platform messaging solution. It uses a client-server architecture where the server sends messages to client apps via a connection managed by the FCM server. The messages can be targeted to specific devices or groups of devices. I've used it to send notifications, targeted messages and updates to users.

9. Describe your experience using Firebase Hosting.

   • Answer: I've used Firebase Hosting to deploy static websites and web apps easily and quickly. I appreciate its features like HTTPS, custom domains, and global CDN distribution for fast loading times. I understand how to configure hosting for various deployment scenarios.

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