Senior AI Scientist - LLMs, RAG & Agentic Systems

RELX International; Ciudad de México; On-site; MXN 900,000 - 1,300,000; Full time

Job summary

LexisNexis Legal & Professional is seeking a Senior II Data Scientist in Mexico City to drive AI innovation using LLMs, RAG, and agentic systems. You will translate business needs into scalable AI solutions and contribute to software development across data ingestion, retrieval, generation, and evaluation components.

You will collaborate with product managers and domain experts to optimize AI performance, deploy production-ready architectures, and ensure responsible AI practices while

Qualifications

• 2 to 5 years of experience in Data Scientist or similar roles.
• At least 1 year of hands-on experience building RAG-based applications and agentic AI systems.
• Ability to design and explain end-to-end AI solution architectures, including data ingestion, retrieval, generation, and evaluation components.
• Strong proficiency in Python, modern AI frameworks (e.g., LangChain, Google ADK), cloud-based development, and software engineering best practices for production of AI systems.
• Experience working with NLP, document processing, search, recommendation systems, or related information retrieval problems.
• Familiarity with embeddings, vector search, and retrieval mechanisms.
• Ability to evaluate AI system performance and diagnose issues related to answer quality, retrieval, hallucinations, or model behavior.
• Experience implementing agentic workflows and multi-agent architectures.
• Proven ability to work closely with Product and stakeholders to understand business needs, gather requirements, and translate them into scalable AI solutions.
• Strong communication skills in English, including the ability to explain technical concepts to different audiences.

Responsibilities

• Lead the end-to-end lifecycle of AI projects (LLMs, RAG, and agentic workflows) from problem definition to deployment and continuous improvement.
• Monitor, evaluate and optimize AI system performance using metrics, user feedback, and experimentation frameworks.
• Partner with product managers, domain experts, and stakeholders to prioritize opportunities and communicate results.
• Contribute directly to software development as an individual contributor.
• Design and implement scalable AI solution architectures, including data ingestion, retrieval, generation, and evaluation components.
• Build and enhance RAG-based applications and AI-powered products.
• Collaborate across teams to solve complex information retrieval and NLP challenges.
• Support continuous improvement of AI systems through experimentation, testing, and performance analysis.

Skills

Python

LangChain

Google ADK

NLP

RAG

Vector search

Embeddings

Multi-agent systems

English communication

Tools

Cloud platforms

APIs & integration

Job description

LexisNexis Legal & Professional is seeking a Senior II Data Scientist in Mexico City to drive AI innovation using LLMs, RAG, and agentic systems. You will translate business needs into scalable AI solutions and contribute to software development across data ingestion, retrieval, generation, and evaluation components.

You will collaborate with product managers and domain experts to optimize AI performance, deploy production-ready architectures, and ensure responsible AI practices while