A Modern C++ developer designs, codes, debugs, and tests software applications using C++ language features and libraries. They utilize modern C++ standards (C++, C++, C++, and C++) to write efficient, maintainable, and portable code. They work on system-level programming, creating high-performance applications and embedded systems. Their responsibilities also include code optimization and memory management. Furthermore, they collaborate with other team members to design software architecture and interfaces, while ensuring code quality through reviews and adherence to coding standards. They may also be involved in research and development of new technologies or algorithms.