NumPy Debugging

MLE / ResearchAnthropicLast reported May 2026Medium Frequency
Reported
4× across candidate reports
First seen
January 2026
Last reported
May 2026
Also asked in
OA
Reported outcome
mixed

Problem Overview

A 60-minute proctored CodeSignal OA (second of two rounds) in which you are given an existing Python/NumPy codebase — specifically a tree-based ensemble model implementation (described by one source as an 'extremely randomized tree' implementation) — that already contains code and a set of unit tests. Six unit tests are…

  • 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.
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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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