Middle Front-End Developer

Sigma Software Group is a global IT consulting company that provides top-quality custom software development, graphic design, testing, and support services to a wide range of industries.

Sigma Software

Employee count: 1001-5000

Brazil only

Develop and maintain web applications using ReactJS and GraphQL
Collaborate with designers and Back-end 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 ReactJS
Strong understanding of JavaScript (ES6+), HTML5, and CSS3
Hands-on experience with GraphQL (Apollo Client or similar)
Familiarity with React Hooks, Context API, and 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
Analytical and problem-solving skills

WOULD BE A PLUS

Experience with Playwright or other automated testing frameworks
Familiarity with CI/CD pipelines and DevOps practices

PERSONAL PROFILE

Excellent communication skills, with proficiency in English at a C1 level or higher
Great problem-solving skills to work with cross-functional teams

We are looking for a Middle Front-end Developer with expertise in ReactJS and GraphQL to join our growing team.

As a Middle Front-end Developer, you will be responsible for developing and maintaining modern web applications, collaborating with designers and Back-end developers to create seamless user experiences.

We are looking for someone passionate about building scalable, high-performance applications, implementing responsive UI components, and optimizing applications for performance and scalability. Additional experience with RESTful APIs, component-based architecture, and state management is highly valued.

This is a great opportunity for a proactive developer eager to grow in a collaborative, remote-friendly environment.

CUSTOMER

Our client has a leading marketplace specializing in pet products.

PROJECT

The client has an innovative customer-focused platform for a top-tier client, a leader in the pet products marketplace. This cutting-edge platform aims to revolutionize the shopping experience for pet lovers, enhancing customer engagement, and streamlining access to a vast range of pet products.

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About the job

Apply before

Oct 28, 2025

Posted on

Aug 29, 2025

Job type

Full Time

Experience level

Mid-level

Location requirements

Brazil

Hiring timezones

Brazil +/- 0 hours

About Sigma Software

Learn more about Sigma Software and their company culture.

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At the heart of Sigma Software Group lies a culture deeply rooted in Scandinavian values, emphasizing mutual respect, transparency, and a minimal hierarchy. This foundation fosters an environment where every voice is heard and valued, empowering our team of over 2000 IT experts to innovate and excel. Since our inception in 2002, our mission has been to build long-term, synergistic relationships not just with our clients, but with our employees as well. We believe that the key to delivering top-quality, value-adding IT services is a team that feels supported, inspired, and driven by a shared passion for finding better solutions. Our culture is one of perseverance, coupled with exceptional client management and strong engineering principles, which has been the cornerstone of our success and sustained growth on the global stage.

Our commitment extends beyond delivering cutting-edge software solutions. We are dedicated to nurturing the growth of the IT ecosystem through our educational platform, Sigma Software University, and fostering the next generation of tech innovators via our corporate venture fund, Sigma Software Labs. This holistic approach reflects our core belief in the power of collaboration and knowledge sharing. We actively encourage our specialists to pursue professional development, offering a continuous education program and a multitude of knowledge-sharing events. This dedication to growth, combined with a flexible work-life balance and a strong sense of community, defines who we are. We are more than just a technology partner; we are a collective of passionate individuals working together to create a better tomorrow, driven by a constant quest for innovation and a commitment to making a positive impact on the world.

Tech stack

Learn about the tools and technologies that Sigma Software uses to build, market, and sell its products.

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JavaScript

iOS

Protobuf

Blockchain

Google Cloud Platform

Docker

Sigma Software employees can create an account to update this tech stack.

Employee benefits

Learn about the employee benefits and perks provided at Sigma Software.

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Discount program

Access to a discount program.

Flexible schedule

Organize your work schedule in a way that suits you.

Remote or office work

You can choose to work from one of our outstanding offices or remotely.

Legal support

24/7 call center for legal advice and urgent lawyer assistance in case of an incident.

View Sigma Software's employee benefits

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