The Same Stream Twice
A hard 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
- hard
- Seniority
- senior
Interview Prompt
A global streaming-video platform collects about 2 billion playback heartbeat events a day from 150 million subscribers, and two teams read the same feed: reliability needs rebuffering spikes per title and region surfaced within seconds so on-call can be paged, while finance pays studios royalties on exact minutes-watched and cannot tolerate a single double-counted or dropped event. Design the pipeline so both teams consume the same durable ingest independently, with the live alerting path running approximate and fast while the daily royalty report counts each raw event exactly once instead of reusing the live aggregation. Keep a malformed heartbeat from a bad device build from stalling the live path.
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