---
title: 'Senior AI Engineer at Lexroom'
canonical: 'https://feeny.ai/job/senior-ai-engineer-lexroom-barcelona-pnbj1w8hjrka'
type: 'job'
last_seen: '2026-10-24'
---

# Senior AI Engineer at Lexroom

- **Company:** Lexroom
- **Location:** Barcelona, Spain
- **Compensation:** €70k–€100k
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-10-22
- **Last confirmed live:** 2026-10-24
- **Apply:** https://jobs.ashbyhq.com/lexroom/2c119a5c-e835-4aeb-9f8b-d1c22d124257

## Job description

[Lexroom](http://Lexroom.ai) 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](http://Lexroom.ai).

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.

Our next goal? Become Europe's most-used legal product.

Why [Lexroom](http://Lexroom.ai)?

- Shape the Standard: Be part of the team setting the benchmark for legal AI in Europe.
- Work with the Best: Collaborate with exceptional colleagues in a culture that values competence, curiosity, and ambition.
- Deliver Meaningful Results: Your contribution will directly influence how legal professionals work—faster, clearer, and more efficiently.

At [Lexroom](http://Lexroom.ai), we leave buzzwords behind. Here, you’ll build something that lasts: a trusted platform, a strong reputation, a new standard for the legal world.

## What You'll Do

- 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.

## What You’ll Bring

- 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.
- Familiarity with MLOps and integrating ML models into production backends (a strong plus).
- 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, knowledge of Italian is a plus.

What Sets Us Apart An Exceptional Team. At [Lexroom.ai](http://Lexroom.ai), you’ll work alongside top talent in tech and legal AI. Our focused teams operate with purpose and autonomy, so every contribution delivers visible results. You’ll collaborate with people who pair innovation with rigor, curiosity with discipline, ambition with depth. Growth that Matters. We hire exceptional people to make a difference—and we give them space to lead. As we scale, your work will shape the future of legal technology and set new standards for the field. Impact is defined by vision and execution, not by age or title. If you’re ready to take responsibility, you’ll find real opportunities to grow and lead high-stakes projects. Rewarding Your Contribution. We value excellence and share success:

- Annual Salary Range: €70,000 – €100,000
- Equity Package: Align your growth with the company’s long-term success.

## Benefits That Matter

- 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.

**At [Lexroom.ai](http://Lexroom.ai), ambition meets discipline and purpose. We’re not just building a product—we’re setting a new standard for the legal world. If you’re ready to contribute to something lasting and meaningful, we’d love to hear from you.**

## About Lexroom

## Company Overview
- **One-liner**: Lexroom provides an AI-powered platform for legal professionals, offering legal research, document analysis, and drafting services with a focus on security, compliance, and professional empowerment.
- **Entity Type**: Private (Series B)
- **Headquarters**: Milan, Italy
- **Founded**: 2023
- **Founders**: Martina Domenicali (CSO), Andrea Lonza (CTO), Paolo Fois (CEO)

## Core Business
- **Primary industry**: Legal Technology (Legal AI)
- **Target customers**: B2B — law firms, in-house legal teams, accountants, and notaries across Europe
- **Mission statement**: "To accustom the legal sector to using artificial intelligence as a tool for professional empowerment, not replacement."

## Products & Services
- **Lexroom AI Platform**: A unified system for legal research, document analysis, and drafting. Provides precise, citable, verifiable answers with source links. Includes a Private Library module for searching internal firm knowledge, and a Microsoft Word Add-In. Available in tiered plans (starting at €75/month per user for the "1" plan, with custom Enterprise pricing).

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Total funding raised — **$71.72M** across Series A and Series B. Latest round: **$50M Series B** led by Base10 Partners (closed ~June 2026)
- **Notable Investors/Partners**: Base10 Partners (lead), Acurio Ventures, View Different (Diego Piacentini), Riccardo Zacconi, Entourage, Verve Ventures, and other strategic angel investors
- **Growth Signals**: 10,000+ customers, 120+ team members, 5 offices across Europe (Milan, Rome, Madrid, Barcelona, Berlin). Rapid growth since founding in 2023, with a clear push to become the European benchmark for legal AI.

## Competitive Advantages
- **Security-first foundation**: ISO 27001 certified, fully compliant with GDPR and the EU AI Act. Zero training on customer data and zero retention policy.
- **Specialized for legal professionals**: Not a general-purpose AI tool; built specifically for lawyers with deep legal terminology and citation accuracy.
- **Human oversight integration**: Designed to amplify professional judgment, not replace it, with full transparency and source verification.
- **Strong European positioning**: Multi-country presence and compliance with European regulations gives it an edge in a market wary of US-based AI tools.

## Strategic Focus
- Becoming the benchmark for AI in the European legal sector
- Expanding across key European markets (Italy, Spain, Germany)
- Deepening product capabilities in research, drafting, and document analysis
- Maintaining strict security and compliance standards as a core differentiator

## Why Work Here
- **Culture**: Described as "international and multicultural" with specialists in law, engineering, data science, product, and customer success. Values include precision, transparency, accountability, and real impact.
- **Work Environment**: 5 offices across Europe (Milan, Rome, Madrid, Barcelona, Berlin). Remote/hybrid policy not explicitly stated, but the distributed office network suggests flexibility.
- **Impact**: Opportunity to "transform the daily lives of thousands of professionals" and solve complex problems in a high-stakes domain.
- **Team**: 120+ employees working alongside experts in AI and law. Described as a place where "ego stays at the door" and genuine collaboration is valued.
- **Growth**: Fast-growing startup with significant funding, offering the chance to build at scale and "set new standards" in legal tech.

## Sources
1. [lexroom.ai - About Us](https://www.lexroom.ai/en/about-us)
2. [lexroom.ai - Product & Pricing](https://www.lexroom.ai/en)
3. [lexroom.ai - Careers](https://www.lexroom.ai/en/careers)
4. [cbinsights.com - Lexroom Profile](https://www.cbinsights.com/company/lexroomai)
5. [LinkedIn - Lexroom](https://it.linkedin.com/company/lex-room)

## Other roles at Lexroom

- [Data Engineer](https://feeny.ai/job/data-engineer-lexroom-milan-qavd5e5zd58r) — Milan, Italy
- [Product Manager (BCN)](https://feeny.ai/job/product-manager-bcn-lexroom-barcelona-wmmr445sceas) — Barcelona, Spain
- [Senior Full Stack Engineer (BCN)](https://feeny.ai/job/senior-full-stack-engineer-bcn-lexroom-milan-81qqk7b9bwnz) — Milan, Italy
- [Senior Full Stack Engineer (BCN)](https://feeny.ai/job/senior-full-stack-engineer-bcn-lexroom-barcelona-2k2n09c3gkjk) — Barcelona, Spain
- [Security & Compliance Lead](https://feeny.ai/job/security-compliance-lead-lexroom-milan-57j7tz6q1j0q) — Milan, Italy
- [Staff Engineer](https://feeny.ai/job/staff-engineer-lexroom-milan-zsjxyc523s60) — Milan, Italy
- [Accountant (Milan)](https://feeny.ai/job/accountant-milan-lexroom-milan-zgbm3c80b01a) — Milan, Italy
- [Legal Engineer | French Market (Paris)](https://feeny.ai/job/legal-engineer-french-market-paris-lexroom-paris-f1s5jzvz236c) — Paris, France
- [Executive Assistant (Milan)](https://feeny.ai/job/executive-assistant-milan-lexroom-milan-4xwvyfnq8rw0) — Milan, Italy
- [Legal Expert | Spanish Market (Madrid)](https://feeny.ai/job/legal-expert-spanish-market-madrid-lexroom-madrid-5zwavjmgx3ne) — Madrid, Spain