Firebase Interview Questions and Answers for experienced

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100 Firebase Interview Questions and Answers

  1. What is Firebase and what are its core services?

    • Answer: Firebase is a comprehensive platform by Google for creating mobile and web applications. Its core services include Realtime Database, Cloud Firestore, Cloud Storage, Authentication, Cloud Functions, Cloud Messaging, Hosting, and more. These services are designed to work together seamlessly, simplifying the development process and providing scalability.

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

    • Answer: Both are NoSQL databases, but they differ significantly. Realtime Database uses a single, global JSON tree, offering immediate data synchronization. Cloud Firestore uses a flexible schema, offers better scalability, strong consistency options, and supports offline capabilities. Firestore is generally preferred for larger and more complex applications.

  3. How does Firebase Authentication work? Describe different authentication methods.

    • Answer: Firebase Authentication provides a backend service and SDKs to authenticate users. It supports various methods like email/password, phone authentication, social logins (Google, Facebook, Twitter, etc.), anonymous authentication, and custom authentication. It handles user management, security rules, and secure token generation.

  4. Explain the concept of security rules in Firebase Realtime Database and Firestore.

    • Answer: Security rules define access control for your data. They're written in a custom security language and determine who can read, write, or modify data based on user authentication and data properties. Properly configured rules are crucial for securing your application's data.

  5. How do you handle offline data persistence in Firebase?

    • Answer: Cloud Firestore offers built-in offline persistence. When enabled, data is cached locally, allowing users to interact with the app even without an internet connection. Changes made offline are synced when connectivity is restored.

  6. What are Firebase Cloud Functions and how are they used?

    • Answer: Cloud Functions are serverless functions written in JavaScript, TypeScript, Go, or Python that run in response to events triggered by Firebase services like Realtime Database, Firestore, or Cloud Storage. They're useful for backend logic without managing servers.

  7. Explain how to implement Firebase Cloud Messaging (FCM).

    • Answer: FCM enables sending push notifications to clients. It involves registering the client app with FCM, obtaining a device token, and using the FCM server APIs or console to send messages. Topics and segmentation can be used for targeted messaging.

  8. How do you handle data synchronization and conflict resolution in Firebase Realtime Database?

    • Answer: Realtime Database handles synchronization automatically. Conflicts are typically resolved using a last-write-wins strategy, but more sophisticated conflict resolution can be implemented using custom logic within your application.

  9. Describe your experience using Firebase Hosting.

    • Answer: [Describe your experience with Firebase Hosting, including deployment methods, custom domains, SSL certificates, and any challenges encountered.]

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