Stock Order / Trade Management System Design

System DesignRobinhoodLast reported April 2026Medium Frequency
Reported
6× across candidate reports
First seen
April 2025
Last reported
April 2026
Reported outcome
mixed

Problem Overview

Design a stock order/trade management system for a brokerage platform (Robinhood-style). The system must allow users to place and cancel stock orders, validate user account balances before execution, and integrate with external exchange APIs (3rd-party) to actually execute trades. The system is required to be reliable (no lost orders), durable,…

  • 4 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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