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Design an ML Rate Limiting Service

HardSystem Design00:00
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Your question is Design an ML Rate Limiting Service. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

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Problem

Scenario

You are building a shared rate-limiting service for a distributed platform with many microservices. Static thresholds are causing false blocks during normal bursts and missing abusive traffic patterns, so the team wants an ML-assisted system that can adapt limits by client, endpoint, and behavior.

Question

How would you design a rate-limiting service that can handle millions of requests per minute across multiple microservices?