CDNTranscodingS3Kafka
Designing YouTube
Video Streaming at Scale
How to handle petabytes of video data and billions of views with sub-second latency.
Read Case Study →Real-World System Case Studies
Go beyond blocks and arrows. These case studies dive into the trade-offs, bottlenecks, and engineering decisions behind the world's largest systems.
ACIDFintechLedgerKafka
Designing Stripe’s Ledger
Immutable Audit Trail & Consistency
How to build a 100% accurate financial ledger using Double-Entry bookkeeping and the Outbox pattern.
Read Case Study →WebSocketsCassandraPresenceXMPP
Designing WhatsApp
Real-time Messaging
Scaling to millions of concurrent WebSocket connections and ensuring message delivery.
Read Case Study →RedisSnowflake IDNoSQLHashing
Designing TinyURL
High-Throughput URL Shortener
Distributed ID generation and Base62 encoding for billions of links.
Read Case Study →Distributed LockingACIDRedisSQL
Designing Ticketmaster
High-Concurrency Booking
Managing seat inventory and preventing double-booking during massive traffic spikes.
Read Case Study →WebSocketsRedisKafkaConcurrency
Designing an Online Auction
Real-time Bidding (eBay Scale)
Handling last-second bid surges with 100% accuracy and real-time updates.
Read Case Study →ACIDFintechLedgerSaga Pattern
Designing a Global Wallet
Fintech Ledger & Payments
Building a reliable ledger with double-entry bookkeeping and the Saga pattern.
Read Case Study →