system-design-interview

Apply system design principles from System Design Interview by Alex Xu. Covers scaling (load balancing, DB replication, sharding, caching, CDN), estimation (QPS, storage, bandwidth), the 4-step framework, and 12 real designs: rate limiter, consistent hashing, key-value store, unique ID generator, URL shortener, web crawler, notification system, news feed, chat system, search autocomplete, YouTube, Google Drive. Trigger on "system design", "scale", "high-level design", "distributed system", "rate limiter", "consistent hashing", "back-of-envelope", "QPS", "sharding", "load balancer", "CDN", "cache", "message queue", "web crawler", "news feed", "chat system", "autocomplete", "URL shortener".