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SO - Frontend - 148 de título at Thaloz. We're looking for a . Very Senior Frontend Developer. to join our client's startup in San Francisco! You'll help build a high-quality, scalable mobile app powered by AI.. This is a part-time role, with an estimated duration of approximately 3 months.. Responsibilities. :. . Design, develop, and maintain complex web applications using React, TypeScript, and Next.js.. . Collaborate closely with product and backend teams to define and implement new features.. . Write clean, maintainable, scalable, and well-tested code.. . Optimize applications to ensure maximum speed and performance.. . Identify, debug, and fix issues in both production and development environments.. . Actively participate in code reviews, mentoring, and the implementation of frontend development best practices.. . Contribute to frontend architecture and key technological decision-making.. . 7+ years of professional experience in software development.. . 5+ years of hands-on experience with React, TypeScript, and Next.js in production environments.. . Strong proficiency in JavaScript and TypeScript.. . Advanced experience integrating with RESTful APIs and third-party libraries.. . Deep understanding of UI/UX design principles and the implementation of responsive and accessible user interfaces.. . Solid understanding of web performance, debugging tools, and user experience optimization.. . Extensive experience with state management patterns (e.g., Redux, MobX, Recoil) and choosing the appropriate solution for each project.. . Proven ability to work independently and as part of an agile team.. . Company Location: Brazil.