This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Desenvolvedor Back-End Pleno based in Brazil. This is an opportunity for a mid-level Back-End Developer to contribute to the stability, evolution, and continuous improvement of financial technology systems. You will work within a support and maintenance environment, addressing bugs, technical challenges, and improvements across multiple platforms. The role combines hands-on development with a strong focus on code quality, reliability, and best engineering practices. You will build and maintain microservices and integrations while working with modern cloud and container technologies. Collaboration, prioritization, and the ability to remove technical impediments will be essential to keeping delivery efficient. The position offers exposure to distributed, high-availability systems and an environment where agile practices and continuous improvement are valued. It is particularly suited to a developer who enjoys solving complex technical problems while contributing directly to business-critical systems.