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Code RoomTrending topics with velocity detection
HardPrep Room Coding #3197

Trending topics with velocity detection

System designDistributed systemsSenior–Staff~45 min

Design a real-time trending-topics system for a global social platform processing 500k events/sec (posts, hashtags, shares). 'Trending' should surface topics with abnormal velocity — not just high absolute volume — refreshed every 60s, regionalized, and resistant to coordinated spam bursts.

What a strong answer looks like

Clarify scale and constraints first. Propose a clean component breakdown, then go deep on the hard parts (data model, bottlenecks, consistency, failure modes) and name the trade-offs you are making.

Clarify5:00 left
Estimate5:00 planned
Design15:00 planned
Deep dive12:00 planned
Failure8:00 planned
0:00
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