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commercetools is seeking a Senior AI Engineer to own AI capabilities end-to-end in a full-stack role. You will build agent loops and orchestration systems, including tool use, structured outputs, business-rule enforcement, and graceful failure handling. Key responsibilities include building integration layers via MCP that enable agents to securely call backend systems and business APIs, rendering model output into live, streamed, accessible UI via generative-UI protocols, and grounding models in real data through retrieval, embeddings, and feedback loops.
You will treat evals as a first-class system, focusing on provable improvement rather than intuition. The role spans the full journey from prompt-in-a-notebook to measured, guard-railed production features. This is a full-time hybrid position based in Valencia, Spain, with flexibility to work from other company hubs including Berlin, Boston, Durham, Munich, or London.
You bring 5+ years of shipping production software with 2+ years building with LLMs in production (real users, not demos). You have hands-on experience with UI protocols such as A2UI, AG-UI, or MCP-UI, and have built against generative/agent-driven UI protocols. Your technical foundation includes prompt/context engineering, agents, tool use, structured outputs, evals, and fluency with MCP in Python and TypeScript/Node + React. You are comfortable with async, streaming, and observability patterns, and have working knowledge of retrieval/embeddings and SQL. Most importantly, you have shipped full-stack apps to production and owned them end-to-end—frontend through backend to deploy and operate—rather than handing off at layer boundaries.
