Three Regions, One Report
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
- L7
Interview Prompt
What daily batch pipeline should the on-call engineer run to turn yesterday's payment logs, which US, EU and APAC each land in their own object storage bucket on their own clock, into a merchant-level summary for global reporting? About 3 billion events arrive a day, and gateway retries resend 1 to 2 percent of them, sometimes after the day has ended.
Summary
Three regions, billions of payments, one merchant summary by 6 AM.
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