Senior UI Developer – (ReactJS / NestJS)

About the company Jobs English Português [PT] Português [BR] Español Share the job: Senior UI Developer – (ReactJS / NestJS) Hybrid São Paulo, SP, BR Location: São Paulo, Brazil — Hybrid Job Description We are seeking a highly skilled and experienced Senior UI Developer with a strong background in React.js, Next.js, NestJS, TypeScript, and unit testing. The ideal candidate has a proven track record of building scalable, responsive, and high-performance web applications. This role requires a collaborative mindset, strong attention to detail, and the ability to take ownership of UI development initiatives from concept through implementation. Key Responsibilities Design, develop, and maintain modern, scalable front-end applications using React.js and NestJS. Write clean, efficient, maintainable, and well-documented code using TypeScript. Implement and maintain unit tests using frameworks such as Jest and React Testing Library to ensure code quality and reliability. Optimize applications for performance, scalability, responsiveness, and overall user experience. Partner closely with UX/UI designers, back-end developers, and Product Owners to deliver seamless user experiences. Mentor junior developers and review their work to ensure adherence to engineering best practices and coding standards. Participate actively in code reviews, architectural discussions, and Agile ceremonies, including sprint planning and retrospectives. Stay current with front-end technologies, frameworks, and industry trends to promote innovation and engineering best practices across the team. Required Skills & Qualifications 10+ years of overall software development experience. Strong expertise in React.js and NestJS. Proficiency in Next.js, TypeScript, and modern JavaScript (ES6+). Hands-on experience with unit and automated testing tools and frameworks, such as Jest, Mocha, and Cypress. Strong understanding of HTML5, CSS3, Sass/SCSS, and responsive web design. Familiarity with state management libraries such as Redux, Zustand, or Recoil. Experience integrating applications with RESTful APIs and GraphQL. Knowledge of CI/CD pipelines and version control platforms such as Git, GitHub, and GitLab. Excellent problem-solving skills and strong attention to detail. Strong verbal and written communication skills, with the ability to collaborate effectively across teams. Education Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field. About the company 🚀 Venha fazer parte da Kstack! Aqui na Kstack, acreditamos que talento e inovação caminham lado a lado.  Somos uma consultoria especializada em conectar os melhores profissionais de tecnologia as melhores vagas do mercado – tanto no Brasil quanto no exterior. Se você busca um ambiente onde seu talento é valorizado e onde há espaço para crescimento, chegou ao lugar certo!  Atuamos com posições estratégicas e táticas na carreira Tech, como QAs, Desenvolvedores, Scrum Masters, Product Owners, Analistas de Negócios, Gerentes de TI e Alta Liderança. 🚀 Se você quer impulsionar sua carreira e fazer parte dessa jornada, vem com a gente! 💙 All rights reserved | © InHire 2026 Full name * Your best email * Cell phone with area code * Linkedin * Get the link to your linkedin profile (Copy the link from your Linkedin profile and paste it into the field above) Are you available to work on the hybrid model at São Paulo, São Paulo, Brasil?* Yes No Resume * Attach resume Salary as contractor * Continue registration By providing your personal data, you agree to what is described in this Privacy Policy. Plugin de acessibilidade da Hand Talk. Recursos Assistivos Acessível em Libras