We seek a Senior Full-Stack Developer with a strong emphasis on front-end development to join our dynamic team. The ideal candidate will have a robust understanding of HTML5, CSS3 (SASS or LESS), and JavaScript (ES6+), with additional skills in either Ruby (preferred) or Java. Experience with Node.js and ReactUI is a significant advantage but not mandatory.  Front-End Development: Develop and maintain responsive, user-friendly interfaces using HTML5, CSS3 (SASS or LESS), and JavaScript (ES6+). Back-End Development: Work with Ruby on Rails or Java to build and maintain the server-side logic and integration. Full-Stack Collaboration: Collaborate with front-end and back-end teams to ensure seamless integration of features. Performance Optimization: Ensure the performance, accessibility, and scalability of the entire stack. Testing and Debugging: Utilize the browser console and other tools for extensive testing and debugging. Team Collaboration: Work effectively within a team using Agile/Scrum methodologies to deliver high-quality solutions.