The Decision Before the Door Closes
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 pipeline scores millions of card transactions a day for fraud before each authorization completes, well under a second after it starts? When scoring is unavailable, a fallback still decides every transaction: small ones go through and large ones are blocked. Chargebacks confirm fraud weeks later and have to reach the weekly model retrain.
Summary
The window to stop it is smaller than you think.
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