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Senior Frontend Engineer - React.JS (Europe, f/m/d) at Factor Eleven. YOUR MISSION. We are looking for a highly-skilled . Senior Frontend Engineer. to join one of our development teams. In this role, you will be responsible for developing and implementing user interface components using React.js with technologies such as TypeScript, GraphQL, Jest, Cypress and Vite, as we build the future of AI-powered digital advertising. You will also be responsible for testing, profiling and improving front-end performance and documenting our front-end codebase, and mentoring your team-mates, planning tasks and estimating workloads.. You'll be working within a cross-disciplinary team under the Engineering Manager to contribute to our multi-tenant SaaS product. This is a high-impact role for someone who thrives on elevating engineering standards, and driving a forward-thinking, . AI-first. approach across the organization. . To ensure success as a senior frontend engineer, you should have in-depth knowledge of React concepts, excellent front-end coding skills, and a great understanding of progressive web applications. Ultimately, a top-class Senior Frontend Engineer should be able to design, plan and build modern user interface components to enhance application performance and coach other team-mates to achieve the same.. YOUR PROFILE. . 6+ years of professional experience in similar position. . Proven expert knowledge of TypeScript, JavaScript, CSS, HTML and front-end languages. . Quality-focused mindset and deep passion for user experience and user interfaces. . . AI-first mindset. , embedding AI and automation into product architecture, engineering workflows, and decision-making processes. . Great knowledge of common frontend tools including React.js, Vite, Jest and Cypress.js. . Great experience with browser-based debugging and performance testing software. . Excellent familiarity with git, npm, docker and Jira. . Great Troubleshooting skills. . Good project management skills. . Extensive experience in mentoring teammates in a respectful, empathic manner. . YOUR RESPONSIBILITIES. . Meeting with the development team to discuss user interface ideas and applications.. . Reviewing application requirements and interface designs.. . Identifying web-based user interactions.. . Developing and implementing highly responsive user interface components using react concepts.. . Writing application interface codes using TypeScript following react.js workflows.. . Troubleshooting interface software and debugging application codes.. . Developing and implementing front-end architecture to support user interface concepts.. . Provide automated unit, e2e and visual regression tests.. . Monitoring and improving front-end performance.. . Documenting application changes and developing updates.. . Participate in code and technical design reviews. . Write and review tasks and estimate workloads for yourself and others. . Provide mentorship to team-members. . Company Location: Germany.