Fractional Share / Stock Trading Coding Problem

CodingRobinhoodLast reported April 2026High Frequency

Reported: 12× across candidate reports
First seen: April 2025
Last reported: April 2026
Reported outcome: mixed

Problem Overview

The round is one graded task with one reported follow-up. Secure Part 1 first; one report has the interviewer saying they do not generally expect candidates to reach the follow-up. Customers of a brokerage buy and sell fractional shares, but the broker can only transact whole shares with the upstream…

2 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.