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# AI engineer

- **Company:** Lexroom Srl
- **Location:** Barcelona, Spain (Remote available)
- **Salary:** €70,000.0 - €100,000.0
- **Contract:** Permanent contract
- **Skills:** Artificial Intelligence, Automated Storage and Retrieval Systems, Python (Programming Language), Machine Learning, Search Technologies, Systems Integration, Reinforcement Learning, Retrieval-Augmented Generation, Large Language Models, Deep Learning, Build Management, AI Platforms, Machine Learning Operations, Full-text Search, Software Coding
- **Published:** October 8, 2026
- **Apply:** https://www.jobleads.com/es/job/ai-engineer--barcelona--e1d5f345fa9ca6cc59d406960f5e5f74b

## About the Role

* Proven expertise in building and managing robust ML pipelines.
 * Strong Python skills with 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 and readiness to work with legal experts, researchers, and engineers to keep improving the product.
 * Up-to-date with LLM innovation, ideally with experience in pre-training or deploying large-scale models in real-world scenarios.
 * Fluency in English, both written and spoken Будет плюсом: Familiarity with MLOps and integrating ML models into production backends (a strong plus); knowledge of Italian is a plus

## Description

Описание

Lexroom is building the AI platform where legal work gets done. In just over two years, we've grown from zero to €25M ARR, and today more than 20,000 legal professionals across Italy, Spain, Germany, France, and Bulgaria rely on Lexroom. We're backed by $73M from Left Lane Capital, Base10 Partners, and Eurazeo, and we're a team of around 300 builders who move fast, say things straight, and own each outcome.

Задачи

 * Design and build agent-driven and RAG-based AI systems to solve complex legal tasks with precision and efficiency.
 * Fine-tune and post-train LLMs using cutting-edge supervised and reinforcement learning techniques to raise response quality.
 * Develop and optimize large-scale search pipelines for LLM-powered agents.
 * Implement and refine NLP algorithms to extract, structure, and validate information from legal documents.
 * Run end-to-end evaluations to pinpoint bottlenecks, measure performance, and guide continuous improvements.
 * Work closely with legal experts to design evaluation protocols and build reliable, domain-specific datasets that strengthen every layer of the stack.
 * Maintain technical excellence by following established best practices, coding standards, and rigorous code-review processes.

Требования

 * Proven expertise in building and managing robust ML pipelines.
 * Strong Python skills with 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 and readiness to work with legal experts, researchers, and engineers to keep improving the product.
 * Up-to-date with LLM innovation, ideally with experience in pre-training or deploying large-scale models in real-world scenarios.
 * Fluency in English, both written and spoken Будет плюсом: Familiarity with MLOps and integrating ML models into production backends (a strong plus); knowledge of Italian is a plus

Условия

 * Annual Salary Range: €70,000 - €100,000
 * Equity Package: Align your growth with the company's long-term success.
 * Hybrid Work: Flexibility to balance remote work with in-person collaboration at our Barcelona office.
 * Health Coverage: Comprehensive insurance to keep you secure and focused.
 * Meal Vouchers: Daily support for your lunch breaks.
 * Performance Bonuses: Rewards directly tied to measurable results.
 * Team Retreats & Off-sites: Dedicated time to connect, collaborate, and spark bold ideas.