A C/C++/ObjC developer designs, codes, tests, and debugs software applications using C, C++, and Objective-C languages. They develop algorithms and data structures to solve complex problems, optimize code for performance and memory usage, and ensure cross-platform compatibility. They also engage in system-level programming, creating software libraries and modules for reuse. They participate in code reviews, write technical documentation, and collaborate with other team members to integrate individual parts into a larger software system. They should be proficient in using development tools, debugging techniques, and understanding hardware-software interactions. They often work in fields like system software, game development, and embedded systems.