Senior Data Scientist – Agentic AI

RELX

Senior Data Scientist III leading design and validation of AI-driven capabilities. Collaborating with engineers to create scalable, customer-facing solutions in the legal domain.

Posted 4/14/2026full-timeCalifornia, District of Columbia, North Carolina, Texas, Washington • 🇺🇸 United StatesSenior💰 $115,400 - $192,300 per yearWebsite

Tech Stack

Tools & technologies

Python

About the role

Key responsibilities & impact

Lead experimentation and model development for AI/ML solutions in legal products
Design and evaluate NLP, LLM, and generative AI approaches (e.g., RAG, prompt strategies)
Define agentic workflows and reasoning strategies for multi-step legal tasks
Define retrieval strategies, including hybrid search (semantic + lexical), and evaluation metrics (e.g., relevance, ranking quality)
Analyze large-scale legal datasets to extract insights and improve model performance
Establish best practices for model evaluation, validation, and benchmarking
Translate experimental results into clear product recommendations and business impact
Collaborate with product, legal experts, and engineers to align solutions with user needs
Mentor team members and provide technical leadership in data science and AI.

Requirements

What you’ll need

Bachelor’s or Master’s degree in a relevant field (e.g., Computer Science, Data Science, Statistics, Mathematics)
Strong experience in machine learning, NLP, and LLM-based modeling
Proven experience designing and running experiments, including model evaluation and iteration
Experience with generative AI techniques (e.g., prompt engineering, RAG)
Experience designing and evaluating hybrid search (semantic + lexical) using embeddings and vector databases
Experience designing agentic workflows and reasoning strategies, with hands-on experience applying agent frameworks (e.g., LangChain, LangGraph, AutoGen) in real-world use cases
Proficiency in Python and data analysis tools
Ability to define retrieval strategies, including hybrid search (semantic + lexical), and evaluation metrics (e.g., relevance, ranking quality)
Able to analyze large-scale legal datasets to extract insights and improve model performance.

Benefits

Comp & perks

Eligible for an annual incentive bonus
Country specific benefits

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

machine learningnatural language processinglarge language modelsgenerative AIprompt engineeringhybrid searchdata analysismodel evaluationPythonagent frameworks

Soft Skills

technical leadershipmentoringcollaborationcommunication

Certifications

Bachelor’s degreeMaster’s degree