Greetings from Ubique Systems!!! ¿Todo listo para enviar su solicitud? Por favor, lea la descripción al menos una vez antes de hacer clic en "Solicitar".We are looking for a Senior Frontend Developer for one of our customer who has an expertise in:- In-depth knowledge of React.Js: Proficiency with core React concepts, components, state management, props, JSX syntax, and modern JavaScript features (ES6+). Strong experience working with design systems: Proven ability to build and maintain reusable, scalable component libraries; direct collaboration with UX designers using tools such as Figma and Storybook is essential. User experience (UX) mindset: All front-end developers are expected to exhibit strong UX attitudes, consistently prioritizing usability, accessibility, and user-centric principles in every aspect of their work. Demonstrable experience as a React developer with a track record of applying design system guidelines and partnering closely with design teams to ensure polished, intuitive interfaces. Familiarity with modern JavaScript features: Proficient in features such as arrow functions, classes, modules, and promises, all of which enhance code readability and maintainability. Experience with front-end build tools: Comfortable leveraging Vite, Babel, npm (or yarn) for development workflows, bundling, and dependency management. Version control systems: Skilled in using Git for version control and team collaboration, including automation with Git actions for continuous integration and deployment. RESTful APIs: Ability to effectively fetch data from and interface with RESTful APIs. Testing frameworks: Proficiency with tools such as SonarQube and GitHub Copilot, integrating tests into CI/CD pipelines, and utilizing frameworks such as Vitest, Pytest, and Playwright; full ownership of code quality and comprehensive testing prior to integration is required. Code quality tools : Familiarity with SonarQube for ongoing code quality and security analysis. Employment type:- B2B Contract. It would be hybrid working in Barcelona, Spain. xsgfvud Note:-Only apply if you have valid visa in the EU Region, Sponsorship will not be given.