Mako Template Engine

Bug SquashStripeLast reported June 2026High Frequency
Reported
27× across candidate reports
First seen
April 2025
Last reported
June 2026
Reported outcome
mixed

Problem Overview

You are given a cloned repository of a modified version of the Mako Python template engine. The repository contains several pre-planted bugs. Your task is to identify and fix up to 3 bugs (some interviewers frame the 3rd as a 'bonus' or 'stretch'). The bugs are independent of each other…

  • 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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