Senior Fullstack Developer (.NET/React)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Fullstack Developer (.NET/React) based in Brazil. We are looking for an experienced Senior Fullstack Developer to design, develop, and scale enterprise-grade web applications using modern .NET and React technologies. In this role, you will take ownership of both backend architecture and frontend development, delivering reliable, high-performance solutions that support complex business needs. You will collaborate directly with North American clients and distributed engineering teams in a dynamic, agile environment. Your responsibilities will span API development, database architecture, cloud integration, and modern frontend engineering. Beyond writing high-quality code, you will contribute to architectural decisions, technical improvements, and engineering best practices. You will also have the opportunity to mentor other developers and influence the technical direction of meaningful projects. This is an excellent opportunity to work on challenging initiatives while continuously developing your technical expertise.