> Markdown version of [/jobs/ext/1468449-lead-fullstack-engineer-react-next-js](https://www.wearedevelopers.com/jobs/ext/1468449-lead-fullstack-engineer-react-next-js). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Lead Fullstack Engineer (React+Next.Js)

- **Company:** N-Ix
- **Location:** Cartagena, Spain
- **Contract:** Permanent contract
- **Skills:** XML Schema, Agile Methodology, Artificial Intelligence, Microsoft Azure, Software as a Service, Continuous Integration, JSON, Microsoft Office, 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:** July 28, 2026
- **Apply:** https://www.buscojobs.com.es/lead-fullstack-engineer-react-next-js-en-cartagena-ID-364785674

## About the Role

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 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.

## Description

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 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.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 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.Benefits- Flexible working format - remote, office-based or flexible- A competitive salary and good compensation package- Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)- Active tech communities with regular knowledge sharing#J-*****-Ljbffr


## Related Videos

- [Boosting OpenSearch Performance: gRPC Search in Action](https://www.wearedevelopers.com/videos/1935-boosting-opensearch-performance-grpc-search-in-action)
- [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling)
- [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock)
- [Tips and Tricks for Working with JSON](https://www.wearedevelopers.com/videos/1229-tips-and-tricks-for-working-with-json)
- [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)
- [Next, Nest, Nuxt… Nust?](https://www.wearedevelopers.com/videos/421-next-nest-nuxt-nust)

## 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)
- [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023)
- [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)
- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)