Middle Frontend Developer

Employment: Full-time Experience level: Mid-Senior Level Job Description   Develop and maintain web applications using React.js and GraphQL Collaborate with designers and backend developers to build scalable, high-performance applications Write clean, maintainable, and efficient code following best practices Implement responsive and user-friendly UI components Optimize applications for performance and scalability Debug and troubleshoot issues across multiple browsers and devices Participate in code reviews and contribute to team knowledge-sharing (Optional) Write and maintain end-to-end tests using Playwright Qualifications 2+ years of experience in front-end development with React.js Strong understanding of JavaScript (ES6+), HTML5, and CSS3 Hands-on experience with GraphQL (Apollo Client or similar) Familiarity with React Hooks, Context API, Redux (optional) Experience with RESTful APIs and third-party integrations Understanding of component-based architecture and state management Knowledge of performance optimization and debugging techniques Upper-Intermediate English level Bachelor’s degree in Computer Science or related field WILL BE A PLUS Experience with Playwright or other automated testing frameworks Familiarity with CI/CD pipelines and DevOps practices   Additional Information PERSONAL PROFILE Detail-oriented developer with a passion for creating seamless user experiences Strong problem-solving skills and ability to work in a collaborative environment Proactive in identifying performance improvements and UI enhancements   Company Description Do you enjoy building sleek, high-performance web applications? We are looking for a  Middle Frontend Developer  to join our  Front-end Development Team . This is a  full-time remote  opportunity based in Brasília, Federal District, Brazil, with flexibility to work from anywhere. At Sigma Software, we partner with global innovators to deliver cutting-edge solutions across industries. In this role, you will work on modern web applications using React.js and GraphQL, collaborating with talented designers, backend developers, and QA engineers to create seamless user experiences. Why join us? You’ll benefit from remote work flexibility, professional growth opportunities, and the chance to work on international projects with a supportive, skilled team. CUSTOMER Our customer is a technology-driven organization delivering modern web solutions to global clients. They focus on creating scalable, high-performance applications with intuitive user interfaces, leveraging cutting-edge frameworks and tools. Their teams work across diverse industries, ensuring each product meets the highest standards of usability, performance, and security. PROJECT The project involves developing and maintaining advanced web applications using React.js and GraphQL. The goal is to deliver seamless, responsive, and user-friendly experiences for end users while ensuring scalability and performance. You will collaborate closely with backend developers, designers, and QA engineers to build robust solutions.