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7F - Frontend Engineer (React) - 114 at Thaloz. We are seeking a highly accomplished and quality-focused Senior Frontend Engineer with deep expertise in React and JavaScript to play a critical role in building and optimizing our modern web applications. You will be instrumental in ensuring the delivery of exceptional user experiences through high-performance, scalable, and meticulously tested frontend solutions. We take immense pride in the quality of our products, and we're looking for an engineer who shares this commitment and brings significant experience in ensuring robust and reliable code.. Responsibilities:. . Lead the development of responsive and high-performance web applications using React and modern JavaScript (ES6+).. . Collaborate closely with UX/UI designers and backend engineers to translate designs and requirements into functional and elegant user interfaces.. . Architect and implement seamless integration of frontend components with various cloud-based services on AWS.. . Write clean, maintainable, well-documented, and rigorously tested code, adhering to the highest quality standards.. . Take a proactive role in code reviews, providing constructive feedback and championing best practices in testing and code quality.. . Drive the optimization of applications for maximum speed, scalability, and responsiveness.. . Ensure the utmost application performance, security, and cross-browser compatibility through comprehensive testing strategies.. . Contribute significantly to technical discussions, bringing your deep expertise in frontend development and testing methodologies.. . . 8+ years of extensive, hands-on experience with React and modern JavaScript (ES6+).. . Expert-level understanding of frontend fundamentals: HTML5, CSS3, and responsive design principles.. . Proven track record of working extensively with AWS services (e.g., S3, CloudFront, Lambda, API Gateway) in the context of frontend applications.. . Deep understanding of RESTful APIs and demonstrated experience in seamless frontend/backend integration.. . Mastery of version control using Git and collaborative development workflows.. . Exceptional problem-solving skills and meticulous attention to detail, with a strong emphasis on code quality and thorough testing.. . Excellent communication and collaboration skills, with the ability to articulate technical concepts clearly and advocate for quality standards.. . Significant experience in implementing and executing various testing strategies, including unit, integration, and end-to-end testing.. . Nice to Have:. . Experience with TypeScript and its benefits in large-scale frontend applications.. . Familiarity with CI/CD pipelines and their role in automated testing and deployment.. . Strong proficiency with modern testing frameworks such as Jest and React Testing Library.. . Company Location: Brazil.