Interactive architecture blueprints, real-world case studies (TinyURL, Twitter, YouTube), back-of-the-envelope calculators, and latency benchmarks for system design interviews.
High-concurrency URL shortening service with Base62 encoding and Redis caching
Distributed multi-region rate limiter preventing API abuse and DDoS using Redis & Token Bucket
Massive scale 1-on-1 and group messaging platform with WebSockets, Cassandra, and Presence Heartbeats
Global video processing pipeline with Adaptive Bitrate (ABR) streaming and CDN edge caching
Timeline generation architecture solving Fanout-on-Write vs Fanout-on-Read for millions of followers
High-concurrency ticket reservation engine preventing overselling with Redis Redlock and Queue Throttling
64-bit time-sortable distributed ID generation producing 10,000+ IDs per millisecond per node
Petabyte-scale web scraping engine with URL Frontier queues, robots.txt politeness, and SimHash deduplication
Real-time geospatial location tracking, driver matching, and dynamic surge pricing engine
Masterless distributed storage engine with Consistent Hashing, Quorum Consensus, and SSTable/LSM-Trees