Welcome to your interview.
The question is on your right: Design API Rate Limiter. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain how you would design a rate-limiting mechanism for an internal security tool that makes concurrent requests to third-party APIs. How would you enforce per-provider limits, handle bursts, retries, and shared state across workers?