Web Crawler

System DesignSnowflakeLast reported September 2026Medium Frequency
Reported
4× across candidate reports
First seen
June 2025
Last reported
September 2026
Reported outcome
mixed

Problem Overview

Design a web crawler (also framed as "Wiki Hopper"). Given a starting webpage that contains multiple internal/external links, design a system (or write code) to crawl and return all reachable pages. You may be given library functions to read web page content and parse URLs. The problem spans…

  • 5 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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