A real-shaped payments ETL matches the section's worked example
A medium Pipeline Design mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.
- Domain
- Pipeline Design
- Difficulty
- medium
Interview Prompt
A real-shaped payments ETL matches the section's worked example. It pulls Stripe payments using NOW() minus a day, joins customer state from Postgres, and row-by-row INSERTs into plain Snowflake. Three idempotency bugs hide in 24 lines (wall-clock window, append-only writes, no partition column). Apply the section's refactor checklist so the pipeline passes both the two-run test and the backfill test.
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write your pipeline design solution with real code execution
- Get instant feedback and a hire/no-hire decision