Referral Program System Design

System DesignRobinhoodLast reported October 2025Low Frequency
Reported
2× across candidate reports
First seen
April 2025
Last reported
October 2025
Reported outcome
unknown

Problem Overview

Design an Employee Referral Program system for a company like Robinhood. The system should handle employees submitting referrals for open positions, track referral outcomes (e.g., hired/not hired), and support a leaderboard showing top referrers — potentially filtered or ranked by geographic region. Core requirements…

  • 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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