A streaming job counts billable ad impressions
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 streaming job counts billable ad impressions. When the job restarts it replays from the last offset and double-counts impressions, inflating revenue. Design the path so each impression counts exactly once even across restarts.
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