AI Engineer

Cross Border Talents
Barcelona, Spain
2 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Compensation
€ 200K

Job location

Barcelona, Spain

Tech stack

Artificial Intelligence
Python
PostgreSQL
Large Language Models
Backend

Job description

You will join a small, high-caliber engineering team growing from 2 to 5, with direct ownership over agent and retrieval systems used daily by internal lawyers.

This is an engineering-first applied AI role focused on shipping reliable, production-grade systems not just experimentation.

What You'll Build

  • Agent systems that automate legal document editing and repetitive workflows
  • Retrieval pipelines that ground outputs with high-quality citations
  • Deep research workflows enabling step-by-step legal investigation
  • Model fine-tuning pipelines as internal data matures
  • End-to-end AI features deployed into real production environments

Tech Environment

  • Python (core language)
  • LLM-powered and agentic architectures
  • Retrieval and search systems
  • Production backend infrastructure
  • AI-assisted engineering workflows, * Meaningful equity in a well-funded early-stage company
  • Unlimited budget for AI coding tools
  • Real ownership of agentic infrastructure
  • Annual Mallorca offsite + regular team gatherings
  • Tight feedback loop with real legal users

Requirements

  • Must be eligible to work in the UK / EU
  • No visa sponsorship currently available
  • Must be able to travel to London every 56 weeks, * Strong production experience building AI systems in Python
  • Hands-on work with LLM-powered or agentic systems
  • Proven model training or fine-tuning experience
  • Ability to translate ambiguous product goals into working systems
  • Track record of shipping end-to-end in fast environments

Nice to Have

  • Experience with vector search or hybrid retrieval
  • Background in collaborative editor or document workflows
  • Exposure to regulated or high-stakes domains
  • Familiarity with GCP, Postgres, or Temporal
  • Experience building products from zero to one

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