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Interview quiz track

First 2 free Intermediate System Design

Backend Developer Interview

Practice interview questions for backend developer roles. Cover REST APIs, databases, authentication, and basic system design. Answer questions and receive feedback on correctness and trade-offs. Ideal for backend interview prep. First 2 questions are free with full feedback.

  • Level Intermediate
  • Questions 12
  • backend
  • developer
  • role

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Sample backend developer interview interview questions

Preview 6 questions from this track in quiz order. In the full quiz you answer one at a time — type or speak — then get a score and feedback.

  1. How would you design a simple REST API for users?

    What a strong answer includes

    Clear resources and methods.

  2. What is the difference between SQL and NoSQL?

    What a strong answer includes

    Trade-offs and use cases.

  3. How do you handle authentication in an API?

    What a strong answer includes

    Tokens or sessions.

  4. Explain database indexing and when to use it.

    What a strong answer includes

    Speeds reads, costs writes.

  5. How would you rate limit an API?

    What a strong answer includes

    Algorithm and storage.

  6. What is idempotency and why does it matter?

    What a strong answer includes

    Safe retries.