ph3Freelance Senior OR Junior Full Stack Developer – React / Next.js / Node.js – Barcelona /h3 pYou 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. /p h3Responsibilities /h3 ul liDevelop and maintain complex, data-heavy user interfaces using bReact and Next.js /b /li liBuild and optimise breusable components /b and contribute to the internal UI library /li liDesign and integrate bREST APIs /b and WebSocket endpoints /li liEnsure code quality through bclean architecture and best practices /b /li liWrite bunit and integration tests /b (Jest / Testing Library) /li liCollaborate with Product, UX, and Data to deliver features end-to-end /li liParticipate in architecture discussions and decision-making /li liTroubleshoot and resolve issues across the stack /li liContribute to CI/CD processes and development workflow improvements /li liMaintain documentation on Confluence /li /ul h3Required Qualifications /h3 ul lib3-5+ years of experience /b as a Full Stack or Front-End Engineer /li liStrong hands-on experience with bReact.js and Next.js /b /li liExperience building and consuming bREST APIs /b /li liGood understanding of backend technologies (Node.js required; Python/FastAPI is a plus) /li liExperience with bcomponent libraries /b, design systems, or shared UI components /li liFamiliarity with modern testing frameworks (Jest, Testing Library) /li liGood understanding of performance, security, and scalability principles /li liComfortable working in cross-functional agile teams /li liStrong communication skills in English /li /ul h3Nice to Have /h3 ul liExperience with container technologies (bDocker /b, AWS ECR/EKS, OpenShift) /li liExperience with CI/CD pipelines /li liKnowledge of SonarQube, Checkmarx, or similar code quality tools /li liExperience in healthcare, pharma, or other regulated environments /li /ul h3What We Offer /h3 ul liFull-time freelance mission /li li3-month contract, renewable depending on performance and roadmap /li liHybrid environment from Barcelona /li /ul h3Seniority level /h3 pMid-Senior level /p h3Employment type /h3 pFull-time /p h3Job function /h3 pInformation Technology /p h3Industries /h3 pPharmaceutical Manufacturing /p pBarcelona, Catalonia, Spain /p /p #J-18808-Ljbffr

📌 Freelance Senior OR Junior Full Stack Developer – React / Next.js / Node.js – Barcelona
🏢 Blu Selection Recruitment Agency
📍 Barcelona