Tree Level-Order Traversal / BFS on Service Dependency Graph

CodingSnowflakeLast reported August 2025Low Frequency
Reported
1× across candidate reports
First seen
July 2025
Last reported
August 2025
Reported outcome
unknown

Problem Overview

Given a graph of services where edges represent dependencies (one service calling another), and given the first service that crashes (starts throwing errors), find all services that will eventually crash. When a service crashes, all upstream services that depend on it also crash. The input is provided as an adjacency…

  • 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.
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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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