Design a Path Key-Value Store (create, set, get, delete on /a/b/c Paths)

Phone ScreenDoorDashLast reported April 2026Low Frequency

Problem Overview

DoorDash phone-screen question, reconstructed from 1 candidate report (April 2026). The write-up includes a Python solution that passes 7 test cases.

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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Every question is reconstructed from multiple independent candidate reports. Follow-ups candidates reported, not invented ones.

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Interviewer Follow-ups

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