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Data Scientist/Engineer – Online Metrics

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Perplexity

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Location:
United Kingdom; Germany; Serbia , London ▼

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

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Job Description:

Perplexity serves tens of millions of users daily with reliable, high-quality answers grounded in an LLM-first search engine and specialized data sources. The Answer Quality team ensures that our prompts, tools, search, and specialized datasets, combined with both frontier and in-house models, create the best possible experience for our users. As a Data Scientist/Engineer on this team, you will derive online signals from user interactions to bridge the gap between changes in answer quality and observed user behavior.

Job Responsibility:

  • Discover and validate online signals from user interactions that serve as reliable proxies for true answer quality
  • Design and implement novel online metrics to be tracked both in A/B testing and on product health dashboards, ensuring alignment with ground-truth evaluations
  • Analyze experimental results to validate these metrics, ensuring they accurately predict user satisfaction and drive product decisions
  • Build and maintain the data pipelines that calculate these metrics at scale, delivering actionable quality signals to Search, Product, and model training teams
  • Communicate findings and bring clarity through close collaboration with Product and Search teams
  • Operate in a small, high-impact team where your work directly shapes how Perplexity measures and improves Answer Quality

Requirements:

  • MS in a technical field or equivalent experience
  • 4+ years of experience working as a Data Scientist, Analytics Engineer, or related role
  • Experience working on search, recommendation, or LLM-based products, with an emphasis on designing online metrics and analyzing A/B experiments
  • Strong proficiency in Python and SQL (expected to write production-grade code)
  • Deep knowledge of statistical analysis
  • Experience with Business Intelligence (BI) tools for visualization and reporting
  • Comfortable with agentic coding workflows and using AI-assisted development tools to iterate faster

Nice to have:

  • Proficiency with Apache Spark and Databricks
  • Experience with the development or validation of LLM-as-a-judge systems
  • Prior work supporting customer-facing products at scale

Additional Information:

Job Posted:
February 21, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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