Senior Full Stack AI Native Developer (Madrid)

Responsibilities

• Build and scale full-stack solutions across A.I technology stack using Javascript/Typescript.
• Design, implement, and maintain RESTful APIs with NextJS/Express to manage authentication, data processing, and orchestrate analysis workflows.
• Develop AI agents with Claude SDK, LangGraph, and LangFuse for multi-step reasoning, collaboration, and conditional logic.
• Build and maintain features on React frontend and Node.js (NextJS) backend, creating intuitive UIs with TypeScript, Vite, React, and custom UI component library.
• Integrate platform with external services, payment providers, and handle asynchronous webhooks.
• Collaborate with AI product managers and specialists to translate complex requirements into scalable features expressed in AI design prompts.
• Contribute to database schema design, write migrations, and manage PostgreSQL & BigQuery databases.
• Use GCP to deploy applications and main...