LexisNexis

Shaping a more just world.

Senior Data Scientist III – AI Evaluation, Prompt Engineering

Data ScientistData ScientistFull TimeRemoteTeam 10,001+Since 1970H1B SponsorCompany SiteLinkedIn

Location

Connecticut + 4 moreAll locations: Connecticut, New Jersey, New York, Maryland, Virginia

Posted

114 days ago

Salary

$124.5K - $207.4K / year

Bachelor Degree3 yrs expEnglishPandasPythonSQL

Job Description

• Evaluate and tune LLM-powered features, such as prompt optimization, retrieval-augmented generation (RAG) systems, and semantic search performance • Design and execute experiments to measure model quality, reliability, and user impact—translating technical findings into product recommendations • Develop and maintain data pipelines for evaluating, tracking, and improving system performance (e.g., accuracy, latency, cost, and relevance metrics) • Analyze structured and unstructured datasets (e.g., product usage logs, document metadata, LLM outputs) to identify patterns, insights, and areas for optimization • Collaborate with product managers to translate product goals into measurable data science questions, propose next steps, and inform roadmap priorities • Provide technical guidance to data engineers who build and maintain analytics and model evaluation infrastructure • Communicate results clearly—through written reports, dashboards, and presentations—to technical and non-technical stakeholders • Stay current on emerging practices in applied NLP, LLM evaluation, and data-driven product development, and thoughtfully adapt them to our environment

Job Requirements

  • 3–6 years of experience in data science, applied NLP, or AI product analytics, preferably within a SaaS or research-heavy product environment
  • Strong proficiency in Python and data analysis libraries such as Pandas; solid working knowledge of SQL
  • Ability to design and evaluate LLM-based systems (e.g., RAG pipelines, prompt evaluations, output scoring), even if not specialized in deep learning
  • Experience with data exploration, experimentation, and reporting—from defining metrics to visualizing and interpreting results
  • Comfort working with document-based datasets (e.g., text corpora, metadata, embeddings) and understanding information retrieval/semantic search concepts
  • Excellent written and verbal communication skills—able to present complex ideas simply and persuasively across distributed teams
  • Proven ability to self-direct, learn new tools and concepts quickly, and apply them pragmatically
  • Strong sense of curiosity, patience, and collaboration—especially in working across different disciplines and cultures

Benefits

  • Flexible remote-first work environment, with the option to work from our New York office
  • Comprehensive health coverage, including medical, dental, and vision plans
  • Retirement plan with inclusive risk benefits (disability, critical illness, life cover, and funeral cover)
  • Modern family benefits, including adoption, surrogacy, and parental leave
  • Paid study leave and professional development support
  • Well-being initiatives and opportunities for sabbaticals and personal growth
  • A culture that values work/life balance, clear communication, and continuous learning

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