This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Pessoa Desenvolvedora de Sistemas Sênior C++ based in Brazil. Join a technology team focused on maintaining and improving critical legacy systems through reliable, high-performance software development. In this senior role, you will work on complex technical challenges, troubleshoot existing applications, and implement new features that support system stability and continuous improvement. You will apply your expertise in C++, object-oriented programming, data structures, and performance analysis to develop effective technical solutions. Working collaboratively with other developers, you will help maintain software quality, integrity, and long-term maintainability. This opportunity is ideal for someone who enjoys solving complex problems, understanding established systems, and contributing to technically demanding projects. The position is fully remote and offered under a Brazilian independent contractor (PJ) arrangement.