A C++ developer utilizes the C++ programming language, an extended version of the C++ standard, to design, code, test, and debug software applications. They write efficient, maintainable, and reusable code. They use C++ features like new character types, multithreading support, improved error handling, and extended libraries. They also optimize applications for performance and memory utilization. Additionally, they collaborate with other team members to design software architecture and interfaces, participate in code reviews, and troubleshoot any issues that arise during the software development lifecycle. They also stay updated with the latest programming trends and technologies.