Senior Full Stack Developer, Java, React

Sigma Software Group

Senior Full Stack Developer at Sigma Software creating a robust platform for a pet products marketplace. Involving in high-impact projects with modern technologies and collaborative teamwork.

Posted 7/11/2026full-timeRemote • 🇧🇷 BrazilSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and implementing large-scale distributed systems with a focus on scalability, low latency, and fault tolerance. Proficient in developing REST APIs, utilizing modern frontend frameworks like React, and optimizing solutions for high performance in cloud environments.

Highest-signal resume keywords

Java ProgrammingReact FrameworkREST API DevelopmentAWS Cloud PlatformCI/CD Pipelines

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Object-Oriented ProgrammingDesign PatternsAlgorithmsData StructuresUnit TestingPerformance TestingEvent-Driven SolutionsMulti-Tier Web ApplicationsGraphQLHigh-Load System Optimization

Soft Skills

Analytical SkillsProblem-Solving Skills

Tools & Technologies

DockerKubernetesLinuxUnixHBaseCassandraMongoDBRedshiftGoogle CloudAzure

Industry Keywords

E-Commerce

Tech Stack

Tools & technologies

Amazon RedshiftAWSAzureCassandraCloudDistributed SystemsDockerGraphQLHBaseJavaKubernetesLinuxMongoDBNoSQLReactSwiftUnix

About the role

Key responsibilities & impact

Design, develop, and implement large-scale distributed systems to handle substantial data volumes, ensuring scalability, low latency, and fault tolerance
Implement APIs and event-driven solutions to meet system requirements and enhance functionality
Create and execute comprehensive unit tests, API tests, regression tests, and performance tests to ensure the reliability and efficiency of the system
Utilize modern frontend frameworks like React for web development
Optimize solutions for scalability, reliability, and high performance
Collaborate closely with cross-functional teams to promptly address and resolve production incidents, ensuring minimal downtime and swift recovery

Requirements

What you’ll need

5+ years of experience in software development with object‑oriented programming languages, specifically Java
Solid hands-on experience with frontend frameworks, specifically React
Extensive experience in building multi‑tier web applications and creating REST APIs
Strong understanding of OOP principles, design patterns, algorithms, and data structures
Practical knowledge of cloud platforms like AWS, Google Cloud, or Azure
Experience with CI/CD pipelines and containerization tools like Docker or Kubernetes
Familiarity with both relational and NoSQL databases such as HBase, Cassandra, MongoDB, Redshift
Hands‑on experience in Linux/Unix environments
Strong analytical and problem-solving skills
At least an Upper-Intermediate level of English
Experience with GraphQL will be a plus
Understanding of high-load system optimizations in the E-commerce domain

Benefits

Comp & perks

Flexible work arrangements