Vacancy Description
Job title: Senior Product Engineer (AI-Native)
Location: Remote (Within Spain)
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 a compass, not a report card
- B...
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