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🥝 Senior Full Stack AI Native Developer (Madrid)

Leadtech | madrid, Spain | Posted June 15, 2026

Job Description

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...

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