Senior Full Stack Developer (Python + React)

Google Chrome Microsoft Edge Apple Safari Mozilla Firefox Senior Full Stack Developer (Python + React)Full-timeCompany DescriptionLooking to build large-scale E-commerce solutions used by millions of customers? We are seeking a Senior Full Stack Developer with strong Python and React expertise to join a high-impact project for a leading pet products marketplace. This is a full-time remote opportunity based in Brazil.We at Sigma Software create innovative digital products that combine scalability, performance, and outstanding user experience. In this role, you will collaborate with experienced engineers and cross-functional teams to develop modern distributed systems and customer-focused web applications.Why join us? You will work with modern technologies, influence architectural decisions, and contribute directly to the growth of a large-scale E-commerce platform while enjoying flexible work conditions and professional development opportunities.CUSTOMEROur Customer is a leading marketplace specializing in pet products with a strong online presence and a large-scale digital commerce ecosystem. The company offers an extensive catalog of products for pet owners, including food, accessories, and healthcare solutions. Focused on customer satisfaction and innovation, the organization continues to expand its E-commerce capabilities to deliver seamless shopping experiences to millions of users.PROJECTThe project focuses on developing a scalable and high-performance E-commerce platform for a major pet products marketplace. The solution is designed to support millions of customers while ensuring reliability, low latency, and fault tolerance across distributed systems. The team is building modern backend services, event-driven architectures, and responsive frontend applications to enhance customer experience and support business growth.Key Technologies: Python, React, REST APIs, GraphQL, AWS, Google Cloud, Azure, Linux, MongoDB, Cassandra, HBase, Redshift, MicroservicesJob DescriptionDesign, develop, and implement large-scale distributed systems capable of handling substantial data volumesBuild scalable backend services and microservices using PythonDevelop and integrate REST and GraphQL APIsCreate responsive frontend functionality using ReactImplement event-driven solutions to improve scalability and system performanceDevelop and execute unit, API, regression, and performance testsOptimize applications for scalability, reliability, and low latencyCollaborate with cross-functional teams to troubleshoot and resolve production incidentsContribute to architecture discussions and technical decision-making processesQualifications5+ years of software development experience with object-oriented programming languages, including PythonStrong backend development experience with PythonExperience building scalable distributed systems and microservicesPractical experience with REST and GraphQL APIsStrong understanding of OOP principles, design patterns, algorithms, and data structuresCommercial experience with ReactHands-on experience working in Linux/Unix environmentsExperience with cloud platforms such as AWS, Google Cloud, or AzureFamiliarity with relational and NoSQL databases including HBase, Cassandra, MongoDB, and RedshiftAbility to work independently and collaboratively in distributed teamsUpper-Intermediate English level or higherWILL BE A PLUSExperience with high-load E-commerce platformsKnowledge of event-driven architecture patternsExperience with performance optimization and observability toolsFamiliarity with CI/CD pipelines and DevOps practicesExperience supporting production environments with high availability requirements Additional InformationPERSONAL PROFILEStrong problem-solving mindsetOwnership and accountabilityProactive communication skillsAbility to work in fast-paced environmentsTeam-oriented attitude with collaborative mindsetBy clicking the link above or any third-party link within this posting, you are...