Senior Fullstack Engineer (React + Node. Js)

We're looking for a skilled Senior Full-Stack Developer to help build and improve a modern cloud platform used by companies worldwide to manage sustainability and compliance. You'll develop high-performance applications without worrying about infrastructure or scaling - the platform handles it all. You'll work with an international team and contribute to a product used by leading global organizations. This role is based in Madrid, with a hybrid schedule (3 days in office + 2 remote). Build and improve full-stack features (React + Node.js) Create software that automates complex compliance workflows Work in small agile squads (5-7 people) with Product & Design Write high-quality, well-tested, secure code Design and review architecture decisions for web applications Support and mentor junior developers Strong experience with React, Node.js, JavaScript, TypeScript Experience with APIs (REST, GraphQL, etc.) Comfortable working in agile teams Fluent English (C1) - Spanish is a plus

Hybrid working model for a strong balance Fun team events and global meetups Modern offices in Madrid and other global locations