Module 17
Apply everything you've learned: classic system design problems broken down step by step with architecture diagrams and trade-off analysis.
Classic interview problem: hash generation, collision handling, redirect performance, analytics tracking, and scaling to billions of URLs.
Real-time messaging: WebSocket connections, message delivery guarantees, group chats, presence indicators, media handling, and end-to-end encryption.
Fan-out on write vs fan-out on read, ranking algorithms, timeline generation, celebrity problem, and real-time updates for millions of users.
Video upload pipeline, transcoding, adaptive bitrate streaming, CDN distribution, recommendation engine integration, and handling peak traffic.
Real-time location tracking, matching algorithm, ETA calculation, surge pricing, trip management, and payment processing at scale.
Web crawling, inverted indexes, ranking algorithms (PageRank, BM25), query parsing, autocomplete, and serving results with low latency.
Product catalog, inventory management, shopping cart, checkout flow, payment processing, order fulfillment, and handling flash sales.
Multi-channel notifications (push, email, SMS, in-app): template management, user preferences, delivery tracking, rate limiting, and priority handling.