Senior Full Stack Developer (Java + ReactJS)

Join Sigma Software as a Senior Full Stack Developer to build scalable, high-performance systems for a leading pet products marketplace. You will design, develop, and implement large-scale distributed systems, APIs, and modern web interfaces using Java and React. This role involves optimizing solutions, ensuring reliability through testing, and collaborating with cross-functional teams to deliver a robust, customer-focused e-commerce product.

Must Have

• Design, develop, and implement large-scale distributed systems
• Implement APIs and event-driven solutions
• Create and execute unit, API, regression, and performance tests
• Develop modern web interfaces using React
• Optimize solutions for scalability, reliability, and performance
• 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
• Upper-Intermediate level of English

Good to Have

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

Company Description

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.

Job Description

• 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

Qualifications

• 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

Additional Information

PERSONAL PROFILE

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