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
Find restaurants that deliver to you, check out without double charges, time couriers to the kitchen and track them live: one-hour boards for junior, senior and staff, with the theory behind them.
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
Push, email, SMS and in-app for a billion deliveries a day: priorities that never wait, promotions that never arrive late, no duplicates a user would notice. 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
Live comments for millions of viewers: SSE streams, a Redis channel per video with co-located viewers, sampling and CDN snapshots for hot videos: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Live prices to five million phones through per-symbol pub/sub, and market and limit orders over FIX that are never lost, sent twice or overspent: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Take bids on 10 million live auctions with one consistent highest bid, lose none, push the price to every watcher and end each auction fairly: one-hour boards for junior, senior and staff, with the theory behind them.