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Question
How would you design a rate limiter for an API?
What it means
Tests your understanding of distributed systems, trade-offs between algorithms (token bucket vs sliding window), and production considerations.
Strong response approach
Start with requirements (per-user vs global, precision needed), propose an algorithm, discuss storage (Redis), and address edge cases like distributed environments.
Good response pattern
Pitfall to avoid
Why this is strong
Useful for interviewer-question style entries.