sr React Engineer

**Job Title: Senior UI Developer – ReactJS / Next.js / TypeScript** **Location: Sao Paulo, Brazil (Hybrid)** **Experience Level: 8\+ Years (Mid\-Senior Level)** **Employment Type: Contract** **Job Description:** We are seeking a highly skilled and experienced Senior UI Developer with a strong background in ReactJS, Next.js, TypeScript, and Unit Testing. The ideal candidate will have a proven track record of building scalable, responsive, and high\-performance web applications. This role requires a collaborative mindset, attention to detail, and the ability to lead UI development initiatives from concept through execution. **Key Responsibilities:** * Develop and maintain modern, scalable front\-end applications using ReactJS and Next.js. * Write clean, efficient, and well\-documented code using TypeScript. * Implement unit testing frameworks (e.g., Jest, React Testing Library) to ensure robust code quality. * Optimize application performance, scalability, and user experience. * Collaborate with UX/UI designers, backend developers, and product owners to deliver seamless user experiences. * Review and mentor the work of junior developers to ensure adherence to best practices and coding standards. * Participate in code reviews, architectural discussions, and agile ceremonies (e.g., sprint planning, retrospectives). * Stay current with front\-end technologies and trends to drive innovation and best practices within the team. **Required Skills and Qualifications:** * 8\+ years of overall software development experience. * Strong expertise in ReactJS and Next.js frameworks. * Proficient in TypeScript and modern JavaScript (ES6\+). * Hands\-on experience with unit testing tools and frameworks (e.g., Jest, Mocha, Cypress). * Strong understanding of HTML5, CSS3, SASS/SCSS, and responsive web design. * Familiarity with state management libraries such as Redux, Zustand, or Recoil. * Experience with RESTful APIs, GraphQL, and client\-server integration. * Knowledge of CI/CD pipelines and version control systems (e.g., Git, GitHub, GitLab). * Excellent problem\-solving skills and attention to detail. * Strong communication and collaboration skills. **Education:** * Bachelor’s or master’s degree in computer science, Engineering, or a related field.