Senior Full Stack Developer, AI

This is a fully remote position, open to applicants in Spain.

📋 Description

• Developing and expanding platforms and products.

• Collaborating across the A.I. technology stack to ensure a smooth user experience.

• Engaging in projects with a fast-paced delivery approach and utilizing a modern tech stack.

• Designing, implementing, and maintaining RESTful APIs utilizing NextJS/Express.

• Modeling Context Protocol (MCP) Knowledge Agents using the Claude SDK.

• Creating AI Agents capable of executing actions and managing multi-step reasoning.

• Developing and maintaining features on both the React frontend and Node.js (NextJS) backend.

• Constructing intuitive user interfaces with TypeScript, Vite, React, and a UI component library.

• Integrating the platform with various external services.

• Collaborating closely with AI product managers and specialists.

• Contributing to the design of database schemas and writing migrations.

• Assisting in application deployment and maintaining cloud infrastructure.

⛳️ Requirements

• Extensive knowledge and experience with the Python framework.

• In-depth experience with API integration involving third-party vendors.

• Ability to work with various SDKs to quickly integrate into products.

• Highly skilled in TypeScript and its application in both frontend (React) and backend (Node.js) environments.

• Strong expertise in React and modern state management techniques, including Hooks and the Context API.

• Solid experience in building and consuming REST APIs using Node.js and NextJS or Express.

• Familiarity with databases such as PostgreSQL and experience working with an ORM or query builder.

• Knowledge of LangGraph, LangChain, and LangFuse.

• A collaborative problem-solver, enthusiastic about tackling new challenges.

• A genuine passion for and understanding of artificial intelligence.

🏝️ Benefits

• Competitive salary.

• Full-time permanent contract.

• Comprehensive private health insurance (including dental and psychological services).

• 25 days of vacation plus a day off for your birthday, with flexible vacation options—no blackout days!

• Flexible schedule with flextime and the option to work fully remote or from our Barcelona office.

• Free Friday afternoons with a 7-hour workday.

• A 35-hour workweek in July and August, allowing you to enjoy the summer!

• Internal training and an annual budget for external learning opportunities.

• Ticket restaurant and nursery vouchers, paid directly from your gross salary.