Where the Crowd Goes
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
- mid
Interview Prompt
We run a live-shopping marketplace where the home screen shows a leaderboard of the hottest livestreams right now, scored by live engagement like viewers joining, bids landing, and reactions. Design the pipeline behind the API that serves this leaderboard: millions of clients poll it, and a stream that was quiet a minute ago can suddenly spike, so the board has to reflect engagement within seconds while read traffic never stalls the ranking updates.
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