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Senior Front-End Engineer at Coin Factory. We are looking for a highly skilled Senior Front-End Engineer with deep expertise in Next.js and strong communication skills in English to join our growing product team. You will lead front-end development efforts, translate UI/UX designs into clean and efficient code, and collaborate closely with product managers, designers, and back-end engineers to deliver world-class user experiences. . Key Responsibilities: . Design and build scalable front-end applications using Next.js, React, and modern web technologies . Collaborate with cross-functional teams to define, design, and ship new features . Optimize components for maximum speed, scalability, and accessibility . Maintain high code quality through code reviews, testing, and documentation . Mentor junior developers and contribute to technical decisions and architecture . Stay up-to-date with the latest trends in front-end development and bring innovative ideas to the team .  .   . Required Qualifications: . 5+ years of front-end development experience, with at least 2+ years using Next.js . Proficiency in JavaScript, TypeScript, HTML5, and CSS3 . Strong knowledge of React ecosystem and modern state management libraries (e.g., Redux, Zustand, or Context API) . Experience with server-side rendering (SSR), static site generation (SSG), and API integration . Comfortable working in Agile environments with CI/CD workflows and Git . You must be able to write clear and correct English. . Experience with RESTful APIs and modern tools such as Figma, Storybook, and testing libraries (e.g., Jest, Testing Library) . Experience with successful projects where you were part of the development team. . Experience with monitoring and logging tools. . Experience in implementing authentication with JWT and OAuth2 while taking security considerations into account. . Experience with Docker and the ability to containerize projects. .   . Preferred Qualifications: . Experience with performance optimization and Lighthouse metrics . Familiarity with design systems and component-based architecture . Knowledge of authentication, SEO, and accessibility best practices . Experience working with international or distributed teams . Contributions to open-source projects or a personal portfolio .   . Company Location: Switzerland.