Users Linked by Device or Card

OAStripeLast reported June 2026Low Frequency
Reported
1× across candidate reports
First seen
June 2026
Last reported
June 2026
Reported outcome
unknown

Problem Overview

A multi-part fraud detection problem. The prompt was posted only as images, which are not recorded; the parts below are reconstructed from a commenter's posted solution and its sample data, so confirm details with the interviewer. You are given a list of transactions, each containing a user ID, a device…

  • 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.
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