Senior LLM Engineer / Researcher

Location: Barcelona, Madrid, Zaragoza, San Sebastian (on-site with some flexibility).

We are partnering with a well-funded, rapidly scaling deep-tech company operating at the intersection of advanced AI and next-generation computing to find its next Senior LLM Engineer / Researcher. Their team combines world-class researchers and engineers working on cutting‑edge challenges in large‑scale LLM model development, optimization, and deployment.

This is an opportunity to join a highly technical environment where you will directly contribute to the future of large language models, not just apply them.

Key Responsibilities

• Design and train transformer‑based models from scratch, including large‑scale pretraining pipelines.
• Contribute to post‑training workflows such as SFT, RLHF, and DPO.
• Build and optimize large‑scale data pipelines for training and evaluation.
• Improve model performance ...