Are you passionate about building trustworthy Generative AI solutions that deliver accurate, source-grounded results?

Do you enjoy solving complex retrieval and search challenges while shaping the next generation of AI-powered legal and professional technology?

About our Team
LexisNexis Legal & Professional, which serves customers in more than 150 countries with 11,800 employees worldwide, is part of RELX (http://www.relx.com), a integral 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
We are seeking an AI Engineer focused on Retrieval-Augmented Generation (RAG) to help design, build, and optimize AI-powered experiences. In this role, you will contribute to the development of retrieval systems, evaluation frameworks, and source-grounded Generative AI solutions that enable users to access trustworthy and relevant information. You will work with advanced AI technologies while helping ensure quality, accuracy, and responsible AI practices.

Responsibilities
- Design, build, and optimize Retrieval-Augmented Generation (RAG) applications.
- Develop and manage document ingestion, chunking, embedding generation, retrieval, reranking, and source-grounded response workflows.
- Design and operate vector search solutions using modern vector database technologies.
- Validate retrieval quality, citation accuracy, rele

📌 Senior Machine Learning Engineer III (Ciudad de México)
🏢 RELX
📍 Ciudad de México