Colander Validation Library

Bug SquashStripeLast reported May 2026Low Frequency
Reported
1× across candidate reports
First seen
May 2026
Last reported
May 2026
Reported outcome
unknown

Problem Overview

You are given a real Python validation library (Colander) codebase and must fix a series of bugs. Multiple validators run together and their errors are aggregated into a structured dictionary via asdict(). Three bugs are presented, each accompanied by clearly described failing test cases and the exact commands to reproduce…

  • 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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