The Register Never Sleeps
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
- Seniority
- L5
Interview Prompt
We run a 600-store retail chain feeding a Snowflake warehouse, but the POS terminals only bulk-upload each day's sales to S3 after close, so operations is blind to intraday numbers and learns that a store went dark mid-afternoon only when the nightly totals come in low. Build a pipeline that lands each sale in the warehouse within minutes and raises an alert when a store stops sending during business hours. Voids and same-day price corrections arrive as new events that reference the original transaction, and each has to update that original in place instead of adding a second row.
Summary
Every swipe lands in the warehouse. The table has to stay current without breaking.
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