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microsoft · data-scientist · system-design

Design a feed ranking service. How would you balance freshness, relevance, and spam prevention?

Difficulty: Medium

Overview

Covers ranking pipeline, feature stores, and abuse mitigation.

Example Answer

  • Two-stage pipeline: recall with heuristics, rank with ML model.
  • Use real-time features for freshness; add reputation signals for spam.

Tips

  • Explain candidate generation vs. ranking stages.
  • Use feature store + online inference.
  • Add guardrails for spam/abuse.

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