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Implement a rate-limiter to control API requests per user.

General/Otherhard0.4 min readPremium
Frequency
Low
Asked at 1 company
Category
243
questions in General/Other
Difficulty Split
151E|43M|49H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Disney+ Hotstar
Key Concepts Tested
partitionwindow
Expert AnswerPremium
83 wordsInterview-ready
Rate limit = restrict requests per user per window. ALGORITHMS: (1) Token bucket—refill rate, consume per request; smooths bursts. (2) Sliding window—exact count in window; more accurate, more state. (3) Fixed window—simple but burst at boundaries. WHY: Protect backends, ensure fair usage, cost control. IMPLEMENTATION: Redis for distributed state—INCR + EXPIRE (fixed); Lua script (sliding)....
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