A C++ developer designs, codes, and debugs software applications using the C++ programming language, a standard version of C++ that includes several enhancements over its predecessor. They use object-oriented programming principles to create efficient and reliable software. Their responsibilities include analyzing user requirements, providing software solutions, and maintaining and improving existing systems. They also test code to detect bugs and ensure software performance. They collaborate with other developers, participate in code reviews, and may document software specifications. Their role requires a deep understanding of C++ syntax, standard libraries, and advanced features.