Senior Backend Engineer: Machine Learning Infrastructure

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Backend Engineer: Machine Learning Infrastructure based in Spain.

• As a Senior Backend Engineer, you’ll help build the infrastructure that enables machine learning teams to develop, deploy, and operate models reliably at scale.
• You’ll own critical backend services, data pipelines, and platform capabilities supporting workloads ranging from traditional machine learning to LLMs.
• The role combines distributed systems engineering, cloud infrastructure, API development, observability, and platform design.
• You’ll work closely with ML and product teams to understand their needs and turn them into reusable, self-service infrastructure.
• You’ll have significant autonomy to make technical decisions, evaluate trade-offs, and take solutions from design through continuous improvement.
• The environment is remote-first, collaborative, and strongly oriented toward ownership, thoughtful engineering, and modern AI-assisted development.
• This is an opportunity to have a direct impact on how teams build and operate machine learning products at scale.