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
Signed HTTPS callbacks for a billion events a day, at least once, retried for three days, with no endpoint able to slow another: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Ten terabytes of logs an hour from host agents through Kafka into tiered OpenSearch and S3, with regex search, live tail and exceptions grouped into issues: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Count 4 million moving drivers per map cell from a million pings a second, and serve the density to a million viewers as cached map tiles: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Rank 200 million players in real time with sharded Redis sorted sets, count every game exactly once, and close a season fairly: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Dish reviews only from customers who ordered them, votes counted from a change stream, reviews ranked by the Wilson bound, payouts made exactly once: 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 committed change in Aurora and DynamoDB, read from the log and delivered in order per row to search, caches, Redshift and an S3 lake: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
A stateful stream processor: dataflow graphs, keyed state in RocksDB, event time and watermarks, windows, barrier checkpoints, exactly-once into Kafka: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
A partitioned, replicated append-only log: a million messages a second, order per key, nothing acknowledged ever lost, a week of replayable history: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
A live TV vote at a million writes a second: spread by key, buffer in Kafka, aggregate the hot counter in two stages, shed what can wait: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Search a billion posts a day by keyword, newest or most liked first, with an inverted index you build yourself: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
A home feed for 2 billion users: fan-out on read, on write, and the hybrid for huge accounts, with precomputed feeds, cursors and hot posts: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Charge cards through the networks exactly once: idempotency keys, a card vault, timeouts as unknowns, signed webhooks, a double-entry ledger and reconciliation. 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.
Classic designOfficial
Watch prices on 500 million products with a polite crawler and a million browsers, verify what you are told, and notify subscribers within minutes of a drop: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
The K most-viewed videos for the last hour, day, month and all time from 700,000 views a second, exactly and in milliseconds: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Collect 5 million samples a second from 500,000 hosts, store them as time series, chart them and page people: one-hour boards for junior, senior and staff, with the theory behind them.
Classic designOfficial
Count every ad click once, fast enough to chart live and exactly enough to bill. One-hour interview boards for junior, senior and staff: requirements, data layer, low-level design and what goes wrong at every component.
Building blockOfficial
Write the row and the event it should publish in one transaction, then relay the event, so a commit and its message can never disagree.