Senior ML Engineer (AI Research)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior ML Engineer (AI Research) based in Spain. This is a senior-level machine learning engineering role focused on applied AI research and the development of advanced intelligent systems. You will work on research problems spanning reinforcement learning, agentic systems, reasoning models, web-scale data, and efficient model training. The role combines rigorous experimentation with strong software engineering and large-scale model development. You will design and execute research experiments, investigate new approaches, and translate promising findings into practical AI capabilities. Your work may involve distributed training across multiple compute nodes and modern deep learning frameworks and infrastructure. You will collaborate with researchers and engineering teams to turn research results into impactful applications and technical contributions. This is an opportunity to work on challenging AI problems in a fast-moving, international, research-driven environment.