Senior AI Engineer (BCN)

The role

You will design and build agent-driven and RAG-based AI systems to solve legal tasks. You will fine-tune LLMs, develop search pipelines, and implement NLP algorithms for legal documents.

What you will do

• Design and build agent-driven and RAG-based AI systems
• Fine-tune and post-train LLMs using supervised and reinforcement learning
• Develop and optimize large-scale search pipelines
• Implement and refine NLP algorithms to extract and validate information
• Run end-to-end evaluations to measure performance
• Work with legal experts to design evaluation protocols and build datasets
• Maintain technical excellence through coding standards and code reviews

Required qualifications

• Proven expertise in building and managing robust ML pipelines
• Strong Python skills
• Hands-on experience in LLM research and deep learning systems
• Knowledge of search technologies such as full-text search, vector databases, or other large-scale retrieval systems
• Collaborative mindset
• Up-to-date with LLM innovation
• Fluency in English, both written and spoken

Nice to have

• Familiarity with MLOps and integrating ML models into production backends
• Experience in pre-training or deploying large-scale models in real-world scenarios
• Knowledge of Italian

Benefits

• Hybrid Work
• Health Coverage
• Meal Vouchers
• Performance Bonuses
• Team Retreats & Off-sites

About the company

Lexroom is building the AI platform where legal work gets done. The team consists of around 300 builders backed by Left Lane Capital, Base10 Partners, and Eurazeo.