Senior Product Engineer (Castilla-La Mancha)

Senior Product Engineer (AI-Native)

Location: Remote (Within Spain)

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Contract: Freelance/Contract

We’re searching for a Product Engineer to support in building a multiplatform AI-powered document system, serving hundreds of thousands of users every month.

Key Responsibilities

• Build and maintain the core multiplatform document system, owning features end-to-end from idea to production across React frontends, Node.Js/Express backends, and PostgreSQL/Databricks data layers
• Design and orchestrate agentic AI workflows using LangGraph, Claude Agent SDK, and MCP protocols;
  integrate LLMs into product features via prompt chains, tool calling, and function execution
• Proactively instrument features, measure impact, seek user feedback, and iterate based on what you discover treating metrics as ...