Senior Data Scientist II

LexisNexis Risk Solutions; California (MO); Hybrid; USD 105,000 - 175,000; Full time

Job summary

LexisNexis Legal & Professional is seeking a Senior Data Scientist II to lead AI-driven capability design within the legal domain. You will guide NLP/LLM efforts, mentor teammates, and drive production-ready AI features.

The role involves collaborating with product teams, legal experts, and engineers to translate experiments into real business impact and actionable product recommendations.

Qualifications

• Master’s degree or higher in a quantitative field (Statistics/CS/Data Science).
• Strong experience in machine learning, NLP, and LLM-based modeling.
• Experience designing and running experiments with model evaluation.
• Experience with generative AI techniques (prompt engineering, RAG).
• Experience designing and evaluating hybrid search using embeddings.

Responsibilities

• Develop NLP, LLM, and generative AI approaches (e.g., RAG, prompts).
• Define agentic workflows and reasoning strategies for multi-step tasks.
• Develop retrieval strategies, including hybrid search and evaluation metrics.
• Analyze large-scale legal datasets to improve model performance.
• Establish best practices for model evaluation, validation, and benchmarking.
• Translate experimental results into 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.

Skills

NLP

LLM modeling

Generative AI

Python

Data analysis

Statistics

Experiment design

Mentoring

Education

Master’s degree

Tools

LangChain

LangGraph

AutoGen

Embeddings

Vector databases

Job description

About the Team:

LexisNexis Legal & Professional, which serves customers in more than 150 countries with 11,800 employees worldwide, is part of RELX (www.relx.com), a global provider of information-based analytics and decision tools for professional and business customers. Our company has been a long-time leader in deploying AI and advanced technologies to the legal market to improve productivity and transform the overall business and practice of law, deploying ethical and powerful generative AI solutions with a flexible, multi-model approach that prioritizes using the best model from today’s top model creators for each individual legal use case. The company employs over 2,000 technologists, data scientists, and experts to develop, test, and validate solutions in line with RELX Responsible AI Principles (https://stories.relx.com/responsible-ai-principles/index.html).

About the Role:

Are you looking to develop your Data Scientist career? Would you enjoy training more junior team members? We are seeking a Senior Data Scientist II to help lead the design and validation of AI-driven product capabilities within the legal domain. This team is global AI platform team that builds AI products and ships AI features to production. The team works on cutting edge AI technology and extensively leverages latest AI tools/Features as part of product.

Responsibilities:

• Develop and implement NLP, LLM, and generative AI approaches (e.g., RAG, prompt strategies).


• Define agentic workflows and reasoning strategies for multi-step legal tasks.


• Develop 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:

• Master’s degree or above in a quantitative or technical field (Statistics, Computer Science, Mathematics, Data Science, etc.).


• Strong experience in machine learning, NLP, and LLM-based modeling.


• Strong 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.


• Strong foundation in statistics, modeling, and large-scale text processing.

U.S. National Base Pay Range: $104,900 - $174,700. Geographic differentials may apply in some locations to better reflect local market rates. This job is eligible for an annual incentive bonus.

We know your well-being and happiness are key to a long and successful career. We are delighted to offer country specific benefits.

We are committed to providing a fair and accessible hiring process. If you have a disability or other need that requires accommodation or adjustment, please let us know by completing our Applicant Request Support Form or please contact 1-855-833-5120.

We are an equal opportunity employer: qualified applicants are considered for and treated during employment without regard to race, color, creed, religion, sex, national origin, citizenship status, disability status, protected veteran status, age, marital status, sexual orientation, gender identity, genetic information, or any other characteristic protected by law.

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LexisNexis Legal & Professional is a leading global provider of legal, regulatory and business information and analytics that help customers increase productivity, improve decision‑making and outcomes, and advance the rule of law around the world. We help lawyers win cases, manage their work more efficiently, serve their clients better and grow their practices. We assist corporations in better understanding their markets and preventing bribery and corruption within their supply chains. We partner with leading global associations and customers to help collect evidence against war criminals and provide tools to combat human trafficking. We endeavour to advance the rule of law across the world. Our teams are combining unparalleled legal and business information with analytics and technology to advance what’s possible for the way our customers work and to advance what’s possible in the world by strengthening the rule of law.