Senior Full-Stack Developer 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. Your work will support important areas such as: Supply chain transparency and human-rights compliance Whistleblower reporting and protection New EU sustainability requirements 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) . What You'll Do 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 Suggest improvements and

new approaches Support and mentor junior developers Requirements Strong experience with React, Node.js, JavaScript, TypeScript Experience with APIs (REST, GraphQL, etc.) Familiarity with Git and collaborative development Product thinking - you care about usability and real outcomes Comfortable working in agile teams Fluent English (C1) - Spanish is a plus What You'll Get Work with a mission that matters - sustainability & transparency A team that values collaboration, innovation, and open communication Hybrid working model for a strong balance Opportunities to grow and learn continuously Eco-friendly mobility options Fun team events and global meetups Modern offices in Madrid and other global locations Interested? Apply now and help build technology that drives transparency and sustainability worldwide.