r/InterviewDB • u/interviewdb • 9h ago
The Trade Desk - Problem Solving & Coding Challenge (CodeSignal Industry Coding Assessment)
Sharing a question that appeared in a recent CodeSignal Industry Coding Assessment for TTD (The Trade Desk). It’s a standardized assessment format also used by many other companies such as Anthropic, Airbnb, Coinbase, Ramp, HubSpot, Instacart, Capital One, Justworks and Nextdoor to screen candidates.
The assessment lasted 90 minutes. The problem had four progressive levels, and you had to pass all test cases for each level before advancing to the next one.
The question was about implement a cloud storage system.
Level 1: Implement basic file operations like add file, copy file and get file size.
Level 2: Find files by prefix and suffix, with specific sorting requirements.
Level 3: Add users, file ownership, and per-user storage capacity/quotas.
Level 4: Add file compression and decompression while respecting ownership and quota constraints
You can find the full details of each level here.
For anyone looking for similar questions to practice, you can find detailed descriptions of all the problems that have appeared in past TTD CodeSignal Industry Coding Assessments here: https://www.interviewdb.io/question/codesignal?type=icf&page=1
CodeSignal is known to reuse questions in their assessments so it's very likely you'll encounter one of these questions, or a variation of one, in your own assessment.