AI Code Craft: Order Refund Workflow as a DAG, Built as Live Services

Also reported as AI Code Craft Workflow Engine · Timeout Refund Workflow · Decision Tree Refund

CodingDoorDashLast reported October 2026High Frequency
Reported
13× across candidate reports
First seen
June 2026
Last reported
October 2026
Reported outcome
fail

Problem Overview

DoorDash coding question, reconstructed from 13 candidate reports (June 2026 to October 2026). Candidates reported 8 follow-ups. The write-up includes a Python solution that passes 12 test cases.

  • 8 candidate-reported follow-ups — the probes candidates report being asked, with the trigger for each
  • The full 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. Follow-ups candidates reported, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The follow-ups candidates reported, with the trigger that prompts each one — plus the mistakes that sink people.
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