Referral Program / Referral Leaderboard Coding

CodingRobinhoodLast reported July 2026Medium Frequency

Reported: 9× across candidate reports
First seen: April 2025
Last reported: July 2026
Reported outcome: mixed

Problem Overview

Robinhood's referral program lets existing users refer new users to the platform. Given two parallel arrays — rh_users (referrers) and new_users (the users being referred) — referrals are processed in order. The referral chain propagates: if A refers B and B refers C, then C counts toward both A's and…

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.