European Union, LATAMWork type:Office/RemoteTechnical Level:LeaderJob Category:Software DevelopmentProject:Leading platform for electronic agreementsWe are looking for a talented Senior Full-Stack Engineer to join a team building a modern, large-scale platform that powers intelligent agreement management experiences for millions of users worldwide. Our platform is at the heart of a general SaaS product used by more than 1.7 million organizations across 180+ countries. The team develops a unified, widget-based front-end architecture that enables seamless experiences across document creation, sending, signing, and management. By combining scalable engineering practices with AI-powered workflows, we are transforming the way businesses manage their most important agreements. As a Senior Engineer, you will play a key role in designing and developing high-performance, reusable frontend solutions while contributing to backend services and platform capabilities. You will work on complex engineering challenges involving micro-frontends, scalability, reliability, security,



and developer productivity.Responsibilities:Design and build scalable, reusable UI components and frontend solutions using React and TypeScript.Develop and maintain backend services using Node.Js and Express.Contribute to a modern micro-frontend architecture and shared platform capabilities.Collaborate with cross-functional teams to deliver high-quality features in a fast-paced SaaS environment.Write well-tested, maintainable code and contribute to a strong engineering culture.Improve performance, reliability, observability, and security across the platform.Participate in the entire software development lifecycle, including architecture discussions, implementation, testing, CI/CD, and production releases.Requirements:8+ years of professional software development experience.Strong expertise with TypeScript and React.Hands-on experience with Node.Js, Express, and modern backend development.Experience building

📌 Lead Fullstack Engineer (Madrid)
🏢 N-iX
📍 Madrid