Senior Machine Learning Engineer

Senior Machine Learning Engineer (Product) – Fixed-Term Contract Location : Madrid or Barcelona (Hybrid)

Contract : Fixed-term until June 2026

We're looking for a Senior Machine Learning Engineer to join a leading European deep-tech company at the cutting edge of AI innovation . This is a chance to make real impact on next-generation large language model (LLM) solutions that are redefining how AI is built, optimized, and deployed.

What You'll Do

Build, optimize, and scale data pipelines for LLM training and fine-tuning.

Develop techniques for data sourcing, cleaning, validation, and enhancement.

Work cross-functionally with ML engineers and researchers to deliver production-ready, high-performance models.

Implement and test advanced compression and optimization methods for AI models.

Stay ahead of trends in LLM architectures, evaluation, and dataset curation.

What You'll Bring

Master's or PhD in Computer Science, AI, Data Science, or related field — or equivalent experience.

4+ years of hands-on experience in ML or NLP (especially with LLMs).

Strong Python skills and familiarity with libraries such as Hugging Face, Pandas, and NumPy.

Experience managing large-scale datasets and distributed computing environments.

Collaborative mindset and solid understanding of modern ML development practices.

What's on Offer

Competitive salary (from €60,000 per annum).

Fixed-term contract until June 2026 with signing and completion bonuses.

Hybrid working model – flexible hours with regular on-site collaboration.

Opportunity to work on cutting-edge AI technology within a fast-scaling, international environment.

This role offers a unique opportunity to work on impactful AI engineering projects while enjoying flexibility, collaboration, and exposure to world-class research and development.