Hiring a C++ developer is advantageous due to their expertise in a mature, powerful language that offers direct control over system hardware, crucial for performance-critical applications. They can effectively manage memory, CPU usage, and write low-level code. Their knowledge in C++, a standardized version, ensures they understand fundamental concepts and can work with legacy systems. Additionally, their skills can be transferable to newer C++ standards, enhancing team adaptability. Ultimately, a C++ developer can provide robust software solutions while optimizing system performance.