System designHardsd-p108

Subject Ml system designLevel Senior~45 minCommon in ML systems interviewsIndustries Technology

Question

Design an ad-targeting / audience-segmentation system that, for a given user and context, selects relevant ads within a tight latency budget.

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.

Learn the concepts

Narrate your design

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Run or narrate your approach, then ask the coach.