💼 Full-Time Position

Senior Product Engineer

🏢
La Fosse
📍 gasteiz, kingdom of spain, Spain
📍
Location
gasteiz, Spain
📅
Posted
June 13, 2026
⏰
Type
Full-Time
🎯

Full-Time Opportunity: This is a permanent, full-time position with a competitive package and real career growth potential.

Job Description

Job title: Senior Product Engineer (AI-Native)


Por favor, presente su candidatura sin demora si su perfil encaja bien con este puesto, debido al alto nivel de interés.

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, ...