Passport Validation Form

CodingStripeLast reported August 2025Low Frequency
Reported
2× across candidate reports
First seen
February 2025
Last reported
August 2025
Reported outcome
unknown

Problem Overview

Build a frontend form UI component for passport number validation. You are given a country-format object (e.g., { USA: "LLDDDD", Canada: "AALLDDDD" }) where L = letter only, D = digit only, A = alphanumeric. The task has three progressive parts: Part 1 – Layout/Display: Render a country dropdown selector…

  • 3 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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