This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Senior Full Stack Developer – Java/React based in Brazil. Join a highly technical, collaborative team building impactful software solutions through modern development practices and continuous innovation. As a Senior Full Stack Developer, you will deliver end-to-end features across Java backend services and React frontend applications, contributing to strategic projects with meaningful business impact. You will participate in architectural decisions, design scalable integrations, and evolve data persistence across relational and non-relational databases. Working within a microservices ecosystem that also connects with legacy systems, you will help solve complex engineering challenges and improve production reliability. AI-assisted development is an integral part of the team's workflow, offering opportunities to apply emerging tools thoughtfully while maintaining rigorous quality standards. This fully remote opportunity is structured for independent contractors and is also open to professionals with disabilities.