Senior Frontend Developer (ReactJS)

Job Title: Senior UI Developer – ReactJS / Next.js / TypeScript Location: Sao Paulo, Brazil (Hybrid) Experience Level: 10 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 devel...