We are looking for a
Senior or Junior 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 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
Advanced knowledge of
JavaScript and TypeScript
Experience building and consuming
REST APIs
Good understanding of backend technologies (Node.js required; Python/FastAPI 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, OpenShift)
Experience with CI/CD pipelines
Knowledge of SonarQube, Checkmarx, or similar code quality tools
Experience in healthcare, pharma, or other regulated environments
What We Offer
Full-time freelance mission
Fixed daily rate: €525/day (senior) OR €375/day (Junior)
3-month contract, renewable depending on performance and roadmap
Hybrid environment from Barcelona