Frontend Developer with English, hibrido

At Winning Consulting we're looking for a Java Front-End Developer to craft accessible, high-performance user interfaces for enterprise web apps. Hybrid Luxemburg Responsibilities Implement UI using HTML5/CSS3 and JavaScript frameworks ( React or Angular ). Integrate with Java back-ends ( Spring / JEE ) and consume REST/GraphQL APIs. Apply database design best practices at the interface layer (data models, contracts) and collaborate with back-end on SQL impacts. Ensure quality with manual & automated tests ; design, execute and report testing results. Build API automated tests (e.g., Postman/Newman, REST Assured) and UI automation (Selenium/Playwright/Cypress). Use test management tools (e.g., Zephyr/TestRail, Jira) and contribute to CI/CD pipelines. Optimize performance (lazy loading, asset strategy) and enforce front-end security (CSP, XSS mitigations). Participate in estimations, code reviews, documentation and adherence to UI standards/design system. Support i18n/l10n and cross-browser/responsive behavior. Required Skills Proven hands-on programming experience in web development. Strong HTML5 and CSS3 ; responsive layout (Flexbox/Grid) and accessibility (WCAG). Solid JavaScript with React or Angular . Knowledge of Java (Spring / JEE) for integration with server-side components. Working knowledge of SQL and database design principles/best practices . Experience with development & build tools (Git, Maven/Gradle) and test automation . Professional English (B2+) . Availability to work on-site in Luxembourg 2-3 days per week . About Winning Consulting Winning Consulting supports clients with consulting, training, staffing and research , applying scientific thinking and proven methods to deliver measurable value in their digital and organizational transformations. More info: About Winning Consulting Winning Consulting supports clients with consulting, training, staffing and research , applying scientific thinking and proven methods to deliver measurable