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Freelance Senior Or Junior Full Stack Developer – React / Next.Js / Node.Js – Barcelona
Freelance Senior OR Junior Full Stack Developer – React / Next.Js / Node.Js – Barcelona 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. 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 Web Socket 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 Confluence Required Qualifications 3-5+ years of experience as a Full Stack or Front-End Engineer Strong hands-on experience with React.Js and Next.Js Experience building and consuming REST APIs Good understanding of backend technologies (Node.Js required;
Python/Fast API is a 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 English Nice to Have Experience with container technologies (Docker, AWS ECR/EKS, Open Shift) Experience with CI/CD pipelines Knowledge of Sonar Qube, Checkmarx, or similar code quality tools Experience in healthcare, pharma, or other regulated environments What We Offer Full-time freelance mission 3-month contract, renewable depending on performance and roadmap Hybrid environment from Barcelona Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Pharmaceutical Manufacturing Barcelona, Catalonia, Spain #J-18808-Ljbffr
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Python/Fast API is a 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 English Nice to Have Experience with container technologies (Docker, AWS ECR/EKS, Open Shift) Experience with CI/CD pipelines Knowledge of Sonar Qube, Checkmarx, or similar code quality tools Experience in healthcare, pharma, or other regulated environments What We Offer Full-time freelance mission 3-month contract, renewable depending on performance and roadmap Hybrid environment from Barcelona Seniority level Mid-Senior level Employment type Full-time Job function Information Technology Industries Pharmaceutical Manufacturing Barcelona, Catalonia, Spain #J-18808-Ljbffr
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