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Code RoomStock trading platform
HardPrep Room Coding #3931

Stock trading platform

System designNetworking & APIsDistributed systemsSenior–Staff~45 min

Design a consumer stock-trading platform (like Robinhood): users place orders, view their portfolio, and see live market data. Focus on the user-facing system, not the exchange's matching engine.

What a strong answer looks like

Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.

Clarify5:00 left
Estimate5:00 planned
Design15:00 planned
Deep dive12:00 planned
Failure8:00 planned
0:00
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.