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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Lead Fullstack Engineer (React+Next.js) - **Company:** N-iX - **Location:** La Unión, Spain (Remote available) - **Contract:** Permanent contract - **Skills:** XML Schema, Agile Methodology, Artificial Intelligence, Microsoft Azure, Software as a Service, Continuous Integration, JSON, Node.Js, Ui Patterns, Next.js, Software Engineering, TypeScript, Test-Driven Development (TDD), ReactJS, Backend, Build Management, Front End Software Development, Restful APIs, Grpc, Web Architecture, Api Management - **Published:** June 18, 2026 - **Apply:** https://es.indeed.com/viewjob?jk=d870ebece7ea8748 ## About the Role Do you have experience in gRPC?, 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 reusable frontend components, design systems, or shared libraries. Solid understanding of frontend testing practices and tools. Experience working on large-scale SaaS products. Knowledge of REST APIs and modern web architecture. Excellent communication skills and ability to collaborate effectively in distributed teams. Nice to Have: Experience with Next.js. Hands-on experience with micro-frontend architecture. Experience with gRPC and API integrations. Knowledge of JSON Schema or XML Schema. Experience with CI/CD pipelines and Azure DevOps. Familiarity with Agile and Test-Driven Development practices. ## Description We 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 global 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., 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. ## Related Videos - [Meet Your New BFF: Backend to Frontend without the Duct Tape](https://www.wearedevelopers.com/videos/682-meet-your-new-bff-backend-to-frontend-without-the-duct-tape) - [Boosting OpenSearch Performance: gRPC Search in Action](https://www.wearedevelopers.com/videos/1935-boosting-opensearch-performance-grpc-search-in-action) - [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json) - [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock) - [Next, Nest, Nuxt… Nust?](https://www.wearedevelopers.com/videos/421-next-nest-nuxt-nust) - [Nest.js - TypeScript in the backend can also be clean](https://www.wearedevelopers.com/videos/1033-nest-js-typescript-in-the-backend-can-also-be-clean) ## Related Articles - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [What’s the Difference Between Frontend and Backend Development?](https://www.wearedevelopers.com/magazine/240-what-s-the-difference-between-frontend-and-backend-development)