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Member of Technical Staff (ML Engineer, Recommendations & User Modeling)

Perplexity· AI Research & Systems
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San Francisco, Palo Alto$220k - $405kFull-timePosted 4mo ago

About the role

ML engineer focusing on designing, building, and optimizing Perplexity’s recommendation, personalization, and user modeling systems to power core experiences and improve key metrics in an LLM-era context.

Responsibilities

  • Own the personalization and ranking behind key product surfaces to make Perplexity more useful and drive impact on core user and business metrics.
  • Build user modeling that captures intent, preference, and propensity, and powers more relevant, more personalized experiences.
  • Design the decision layer that balances competing objectives to produce the best overall experience for the user.
  • Build the data and evaluation foundations that let these systems learn and improve with usage.
  • Help shape the technical direction of ranking, recommendations, and personalization at Perplexity.

Qualifications

  • Deep, hands-on experience building production recommendation, ranking, or personalization systems at scale.
  • Strong ML fundamentals, covering areas such as engagement modeling, model calibration, offline and online metrics, and online experimentation.
  • Experience integrating LLMs into ranking, retrieval, or personalization pipelines.
  • Taste and judgment for how personalization should work in an LLM-native product, and curiosity about reimagining it from first principles.
  • For tech leadership roles, prior experience setting technical direction for recommendation/ranking projects.

Skills

Required:Recommendation/ranking/personalization systemsML fundamentals (engagement modeling, model calibration, offline/online metrics, online experimentation)LLM integration into ranking/retrieval/personalizationPersonalization strategy in LLM-native products

Benefits

  • Full-time U.S. employees enjoy a comprehensive benefits program including equity, health, dental, vision, retirement, fitness, commuter and dependent care accounts, and more.
  • International Benefits: comprehensive benefits program tailored to region of residence.
Last updated Sep 23, 2026. Interested? Apply on the company site.

About Perplexity

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