Senior Full Stack Developer (Java + ReactJS)

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

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Design, develop, and implement large-scale distributed systems with scalability, low latency, and fault tolerance
Implement APIs and event-driven solutions to meet system requirements and enhance functionality
Create and execute unit, API, regression, and performance tests to ensure system reliability
Develop modern web interfaces using React
Optimize solutions for scalability, reliability, and performance
Collaborate with cross-functional teams to resolve production incidents quickly

5+ years of experience in software development with Java
Experience in building multi-tier web applications and creating REST APIs
Strong understanding of OOP principles, design patterns, algorithms, and data structures
Experience with ReactJS for designing maintainable, scalable UI systems
Familiarity with Spring Framework
Hands-on experience in Linux/Unix environments
Practical knowledge of cloud platforms (AWS, Google Cloud, or Azure)
Familiarity with SQL and NoSQL databases (HBase, Cassandra, MongoDB, Redshift)
Upper-Intermediate level of English

PERSONAL PROFILE

Strong problem-solving skills and attention to detail
Ability to work independently
Excellent communication and collaboration skills

Are you a Senior Full Stack Developer who thrives on building scalable, high-performance systems? Join us at Sigma Software and contribute to a cutting-edge platform for a leading pet products marketplace — a solution designed to serve millions of customers and transform the way pet owners shop online.

In this role, you will be part of a skilled, collaborative team working with modern technologies to create a robust, customer-focused product that stands out in the e-commerce space.

Why join us? You’ll be working on a high-impact project where your ideas and technical decisions will directly influence product success and user experience.

CUSTOMER

Our Customer is a leading marketplace specializing in pet products, known for its extensive catalog and strong online presence. With a commitment to quality and customer satisfaction, the company serves a wide audience of pet owners, offering everything from food and accessories to healthcare products.

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About the job

Apply before

Mar 10, 2026

Posted on

Jan 09, 2026

Job type

Full Time

Experience level

Senior

Location requirements

Brazil

Hiring timezones

Brazil +/- 0 hours

About Sigma Software

Learn more about Sigma Software and their company culture.

View company profile

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.

View tech stack

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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