Middle Frontend Developer

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.
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
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
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