Six Hours to Refresh Every Number
A medium Pipeline Design mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- Pipeline Design
- Difficulty
- medium
- Seniority
- L5
Interview Prompt
Design the transformation pipeline behind both the live ratings feed, which clients hold to a 15-second delivery contract, and the corrected price and rating history they query. Our data lead's dbt models in the warehouse cannot serve both: a full refresh takes 6 hours, and incremental runs leave history stale after a split or merger.
Summary
Ratings change. The incremental model has to keep pace.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Draw your pipeline on the design canvas: sources, transforms, storage and checks
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision