A Boost C++ developer utilizes the Boost libraries, a collection of around individual libraries that extend the functionality of C++. Tasks include writing code for high performance applications, debugging, and testing. They also optimize code to improve efficiency and performance, and ensure compatibility across different platforms and systems. They need a thorough understanding of C++ and advanced programming concepts. The developer often collaborates with other team members to design and implement software solutions, manage code libraries, and contribute to the development of complex software applications or systems.