A C++ / developer designs, codes, and debugs applications using C++ /, a version of the C++ programming language with additional features like auto keywords, lambda expressions, and strong type checking. They optimize application performance, ensure software scalability and security, and maintain code quality. They also work on complex problem solving, often developing algorithms and data structures. Their role involves keeping up with the latest C++ standards and technologies, contributing to architectural decisions, and collaborating with other team members. Moreover, they may be responsible for providing documentation and tests for their code.