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Freelance Senior Full Stack Developer – React / Next.Js / Node.Js – Barcelona - €525 A Day
We are looking for a Senior Full Stack Developer to join our team and contribute to the development of a new web platform built with modern JavaScript technologies.You will collaborate closely with the Tech Lead, Product Owner, UX Designer, and Data team to design, develop, and deliver high-quality features within an agile environment.This role requires strong expertise in front-end engineering (React/Next.Js), solid understanding of backend APIs, and the ability to write scalable, maintainable code.Responsibilities- Develop and maintain complex, data-heavy user interfaces using React and Next.Js- Build and optimise reusable components and contribute to the internal UI library- Design and integrate REST APIs and WebSocket endpoints- Ensure code quality through clean architecture and best practices- Write unit and integration tests (Jest / Testing Library)- Collaborate with Product, UX, and Data to deliver features end-to-end- Participate in architecture discussions and decision-making- Troubleshoot and resolve issues across the stack- Contribute to CI/CD processes and development workflow improvements- Maintain documentation on ConfluenceRequired Qualifications- 5+ years of experience as a Full Stack or Front-End Engineer- Strong hands-on experience with React.Js and Next.Js- Advanced knowledge of JavaScript and TypeScript- Experience building and consuming REST APIs- Good understanding of backend technologies (Node.Js required;
Python/FastAPI isa plus)- Experience with component libraries, design systems, or shared UI components- Familiarity with modern testing frameworks (Jest, Testing Library)- Good understanding of performance, security, and scalability principles- Comfortable working in cross-functional agile teams- Strong communication skills in EnglishNice to Have- Experience with container technologies (Docker, AWS ECR/EKS, OpenShift)- Experience with CI/CD pipelines- Knowledge of SonarQube, Checkmarx, or similar code quality tools- Experience in healthcare, pharma, or other regulated environmentsWhat We Offer- Full-time freelance mission- Fixed daily rate: €525/day- 3-month contract, renewable depending on performance and roadmap- Hybrid environment from Barcelona#J-18808-Ljbffr
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Python/FastAPI isa plus)- Experience with component libraries, design systems, or shared UI components- Familiarity with modern testing frameworks (Jest, Testing Library)- Good understanding of performance, security, and scalability principles- Comfortable working in cross-functional agile teams- Strong communication skills in EnglishNice to Have- Experience with container technologies (Docker, AWS ECR/EKS, OpenShift)- Experience with CI/CD pipelines- Knowledge of SonarQube, Checkmarx, or similar code quality tools- Experience in healthcare, pharma, or other regulated environmentsWhat We Offer- Full-time freelance mission- Fixed daily rate: €525/day- 3-month contract, renewable depending on performance and roadmap- Hybrid environment from Barcelona#J-18808-Ljbffr
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