The What-If Machine
A hard 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
- hard
- Seniority
- L5
Interview Prompt
What-if questions about fill rate, reach and frequency keep piling up from our analysts, and a single configuration can mean up to 1,000 simulations. Design the data pipeline behind a system that matches ad inventory (slots) against ad campaigns, so users can submit a configuration and explore the results later.
Summary
A million slots. A thousand campaigns. Every combination matters.
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