Project Deep Dive

Tech Deep DiveRobinhoodLast reported July 2026High Frequency

Reported: 17× across candidate reports
First seen: April 2025
Last reported: July 2026
Reported outcome: mixed

Problem Overview

Robinhood's second most-reported round, after the job scheduler. It appears on almost every onsite, and candidates fail it - one reports strong-hire on both system design and coding and a NO HIRE overall, decided here, with a six-month cooldown. Another was downgraded from Senior to L4 after failing this round.…

13 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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Full problem statements, candidate-reported follow-ups, and walkthroughs — for every Robinhood question.

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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.