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Zigsaw

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Senior Data Scientist, AI/ML Systems

Data ScientistData ScientistFull TimeRemoteSeniorTeam 11-50Since 2016H1B No SponsorCompany SiteLinkedIn

Location

California

Posted

44 days ago

Salary

$139.8K - $287.7K / year

Seniority

Senior

Bachelor Degree5 yrs expEnglishPythonSparkSQL

Job Description

Senior Data Scientist, AI/ML Systems

Zigsaw

• Design and execute system-level measurement frameworks for foundational model improvements spanning offline evaluation benchmarks, online A/B experiments, and longitudinal impact tracking across surfaces. • Define, and own the success metrics that quantify foundational model value. • Build causal inference methodologies to isolate the incremental impact of individual model components within a complex, multi-model production system where changes co-occur and interact. • Work cross-functionally to build relationships, proactively communicate key findings, and collaborate closely with ML Engineers, Applied Scientists, Homefeed and Surface teams to ensure measurement rigor is embedded in every model launch. • Relentlessly focus on impact, whether through sharpening investment decisions with data, raising the bar for launch criteria, accelerating experimentation velocity, or surfacing hidden inefficiencies in the model ecosystem.

Job Requirements

  • 5+ years of experience analyzing data in a fast-paced, data-driven environment with proven ability to apply scientific methods to solve real-world problems on web-scale data.
  • Strong interest and hands-on experience in one or more of: ML system evaluation, recommender system measurement, A/B experimentation at scale, causal inference
  • Deep familiarity with large-scale recommendation or ranking systems and their evaluation including an understanding of how representation learning, retrieval, ranking, and re-ranking stages interact and compound in production.
  • Experience designing and executing A/B experiments for complex ML systems, including multi-surface holdouts, metric decomposition, long-run effect estimation, and interference/spillover mitigation.
  • Strong quantitative programming (Python) and data manipulation skills (SQL/Spark); experience with ML pipelines, feature stores, and large-scale experimentation platforms.
  • Ability to work independently, drive ambiguous projects end-to-end, and operate with high ownership in a fast-moving research-to-production environment.
  • Excellent written and verbal communication skills, with the ability to translate complex system-level findings into clear narratives for technical and non-technical partners including leadership-level investment recommendations.
  • A team player eager to partner across teams to turn measurement insights into better models and faster launches.

Benefits

  • Equity
  • Health insurance
  • Professional development

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