advancedTrading Systems25 of 132

LLD of a stock trading app, functionalities and constraints listed up front

Tests whether you model the order book and matching engine with strict price-time priority and atomic order state transitions, rather than treating buy/sell as independent CRUD operations.

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Generate a complete, structured system design answer — requirements, capacity estimation, API design, architecture, database choice, scaling, caching, fault tolerance, security, trade-offs, and more, walked through the way a strong senior engineer would in a real interview.

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