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Cryptocurrency Exchange System Design
Visual Problem Diagram
Scenario
Bitcoin dumps 15% in ten minutes—matching engine must process 50K orders/s with price-time priority while withdrawals queue to avoid a hot wallet drain. Order book, matching, and wallet security are separate concerns from blockchain full nodes.
Design a cryptocurrency exchange with order placement, matching, balances, deposits/withdrawals, and market data feeds. Matching correctness and fund security dominate over UI polish.
You should support limit/market orders, order book, trade execution, wallet ledger, and real-time tickers. Be ready to explain price-time priority, WAL durability, and hot/cold wallet split.
Constraints
Place/cancel orders, order book, match trades, balances, deposit/withdraw, market data websocket
< 10 ms match latency, deterministic ordering, 99.99% trading availability, secure funds
1M users, 50K orders/s peak per liquid pair, billions daily volume
Stages ahead
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