Where the Crowd Goes

A medium Pipeline Design interview practice problem on DataDriven. Write and execute real pipeline design code with instant grading.

Domain

Pipeline Design

Difficulty

medium

Seniority

mid

Problem

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.

Practice This Problem

Solve this Pipeline Design problem with real code execution. DataDriven runs your solution and grades it automatically.