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Backend Interview Questionsand what they ask next

Interviewers do not stop at your first answer. They change one thing and ask again: now it runs on ten servers, now Redis is down. Every question here comes with the follow-ups that come next, and an AI interviewer scores each step, so you find out how deep you can really go.

ladders
24ladders
questions with answers
96questions with answers
topics
8topics
Climb the rate limiter ladder
One question, four levelsRate limiter
  1. Fresher

    How would you limit each user to 100 requests a minute? Compare a fixed window with a sliding window.

  2. SDE 1Twenty servers

    One user's requests are spread across 20 API servers. Where does the counter live?

  3. SDE 2Bursts

    With a fixed window, a user sends 100 requests at 10:00:59 and 100 more at 10:01:00: 200 in two seconds. How do you prevent that, and how does a token bucket work?

  4. SeniorRedis goes down

    Your rate limiter's Redis becomes unavailable. Do you let every request through or block every request?

Pick a topic

Three ladders each. The first answer on every ladder is free to read; a free account unlocks the follow-ups and AI scoring.

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