Design In-Memory File System

Phone ScreenSnowflakeLast reported December 2025Low Frequency

Reported: 2× across candidate reports
First seen: September 2025
Last reported: December 2025
Reported outcome: unknown

Problem Overview

Design an in-memory file system that supports basic file system operations. This is based on LeetCode 588. You are required to implement a file system class with operations such as: listing directory contents (ls), making directories…

2 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.