Full-Stack Engineer (Backend Leaning) - Platform Engineering

This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Full-Stack Engineer (Backend Leaning) – Platform Engineering based in Spain. As a Full-Stack Engineer with a strong backend focus, you will help build the foundational systems that power a suite of innovative AI products used by millions of people and businesses worldwide. You will contribute to essential platform capabilities, including user management, workspaces, authentication, permissions, and resource access. Depending on your team, you will either improve customer-facing experiences or develop scalable internal services that enable engineering teams to build products securely and efficiently. Working across backend services and frontend interfaces, you will solve complex technical challenges and deliver reliable solutions in a high-growth, AI-first environment. You will take ownership of features from initial scoping through implementation, deployment, and ongoing maintenance, with support from experienced engineers. This remote opportunity offers significant technical autonomy, challenging engineering problems, and the chance to shape the infrastructure behind next-generation AI applications.