AI / Machine Learning Engineer

Location:

Barcelona (Cloudworks Sant Antoni) Contract:

Indefinido 40h/week Salary:

€55k – €65k Gross/Year Remote:

Hybrid (3 days office / 2 days remote + flexibility) Trial Period:

6 months Holidays:

25 working days + Spanish national and Catalan regional bank holidays Social Security & Benefits:

Full social security coverage (Seguridad Social) by the employer as per Spanish law

About Silex

Silex is an AI engineering agency that bridges the gap between R&D and deployment. Led by 3 french engineers, Silex specializes in turning complex data challenges into high-value products.

From our hub in Barcelona, we work with diverse industries (including Energy, Agriculture, and Pharma) to build custom, large-scale AI solutions. We value technical excellence, a "hacker" spirit, and the ability to ship robust, production-grade systems. Building the future requires every kind of mind. Silex is dedicated to creating a space where everyone—regardless of race, gender, identity, or background—feels they belong and can thrive.

We value your potential and your perspective more than a perfect set of credentials.

If you're ready to make an impact, we’re ready to meet you.

The Role & Your Impact

You’ll be joining a team where ownership is a given, but support is always available. Your role isn't just about writing code; it's about seeing the big picture. Thoughtful Problem Solving:

You’ll navigate the full lifecycle of AI projects. We value the "discovery" phase, understanding the problem before writing the first line of code. Building with Precision:

Whether it’s designing RAG systems or fine-tuning ML models, you take pride in clean, maintainable, and production-ready work. Collaborative Strategy:

You’ll work closely with stakeholders to turn abstract ideas into technical roadmaps. We bridge the gap between complex AI and real-world value together. Growth & Mentorship:

As a mid / senior member, you’ll naturally help the team grow, sharing your knowledge and helping us refine our collective vision.

What We’re Looking For

We care more about your ability to learn and adapt than a meeting a specific checklist. We value the following skills : Experience:

You’ve successfully shipped AI/ML solutions to production and understand the nuances of keeping them running. Curiosity:

A natural desire to dive into new domains, whether it’s Energy, Agriculture, or Pharma, and find elegant solutions. Communication:

Proficient in English. If you speak French, that’s a lovely bonus, but not a dealbreaker. Education:

A strong academic background (Master’s or PhD) in a technical field that gave you a solid foundation in first principles.

Technical Landscape

We don't expect you to be an expert in everything on day one, but you’ll likely spend your time with: Python:

Your primary tool, used with best practices. ML & GenAI:

Experience with the PyTorch/TensorFlow ecosystem and modern LLM workflows (LangChain, LlamaIndex, or direct API work). Data & Infrastructure:

Proficiency with Pandas/Polars, Vector Databases, and a comfortable grasp of Docker and Cloud environments (AWS/GCP).

How We Get to Know Each Other

We’ve designed our process to be transparent and respectful of your time: A Friendly Chat (30 min):

A quick call to meet each other, discuss your journey, and see if our goals align. Technical & Collab (2h):

A session at our Barcelona office. We’ll look at a problem together, do some collaborative coding, and discuss how you approach strategy. An open discussion (30min):

A casual conversation with one of our partners. This is as much for you to vet us as it is for us to get to know you.

How to apply

Send us an email with your resume at : jobs@silex-labs.com

Right to Work

Candidates must have the legal right to work in Spain at the time of application. We are unable to offer visa sponsorship or support relocation from outside the EU/EEA. EU/EEA citizens and candidates already holding a valid Spanish work permit are welcome to apply.