[System Design] Distributed Rate Limiter

I have started creating an exciting, analogy-driven Audio Overview (Deep Dive Podcast) covering the complex architecture of a Distributed Rate Limiter for your next system design interview! It will be ready for you to listen to in the Studio tab in just a few minutes.Here is a sneak peek at how the hosts will break down these advanced concepts to make them stick:The "Castle Defense" Analogy (Layered Architecture): The hosts will explain that rate limiting is not a single wall; it's a defense-in-depth strategy. They'll map out the defenses from the outer moat (CDN/WAF blocking IP attacks) to the main gate (API Gateway enforcing per-client rules), down to the inner guards (Service-level business limits).Battle of the Algorithms: The podcast will unpack the five main algorithms with vivid mental models:The "Time Bomb" Race Condition (TOCTOU): The hosts will dive into the silent killer of distributed limiters: the Time-of-Check-to-Time-of-Use bug. If multiple gateways check Redis at the same time, they might all read "1 token left" and incorrectly allow requests. You will learn why executing Atomic Lua Scripts directly on the single-threaded Redis server is the only way to defuse this bomb.Surviving Real-World Disasters: They will roleplay the toughest interview curveballs:This episode will give you the exact technical vocabulary, trade-offs, and "war stories" you need to navigate a 35-minute senior system design interview. Let me know if you want me to generate a quiz or flashcards to test your knowledge on these distributed algorithms!