The design library
Building blocks, complete architectures, and variations worth comparing. Search by the problem you want to solve or a component you want to understand.
Classic designOfficial
Design a team chat app like Slack: channels and DMs in real time, threads, unread counts and search. One-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Real-time rated chess with server-validated moves, lag-compensated clocks, pairing by rating and a million watchers on one game: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Every goal on 25 million open apps within two seconds: SSE or WebSockets, pub/sub to the right server, resume by seq, hot topics, reconnect storms and push: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
A hundred people typing in one document, every copy converging, nothing acknowledged lost: one owner per document, an op log with snapshots, and fenced failover: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Chat for a billion users: sockets on gateways, Redis pub/sub routing, an inbox per device, receipts, media in S3, encryption and regions: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Price a trip, match a rider to a nearby driver who has ten seconds to accept, and never give one driver two rides: one-hour boards for junior, senior and staff, with the theory behind them.