Robinhood Real-Time Stock Price System Design

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

Problem Overview

Design a real-time stock price system similar to the Robinhood mobile app. Core requirements: (1) Users can view real-time (live) stock prices with low latency. (2) Users can query historical price data over multiple time ranges: last 1 day, 1 week, and 1 year. (3) The number of datapoints returned…

  • 5 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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