Hiring a Garbage Collection (GC) developer brings several significant advantages to a software development project. Firstly, GC developers can manage memory efficiently, reducing the chances of memory leaks and system crashes, thereby improving system stability. Their expertise in automatic memory management reduces the burden on other developers, allowing them to focus on core functionalities.

Secondly, GC developers excel in optimizing application performance. They can fine-tune GC algorithms to balance memory usage and processing speed, ensuring the application runs smoothly even under heavy loads.

Thirdly, GC developers can enhance application security. By promptly clearing unused memory, they can minimize the risk of data breaches that exploit residual data in memory.

Fourthly, a GC developer possesses strong problem-solving skills. They can help diagnose and fix complex memory-related issues that are often hard to detect, boosting the overall quality of the software.

Lastly, they contribute to the longevity of the software. With their proficiency in memory management, they can future-proof the software, enabling it to handle increasing data volumes and user loads over time.

Overall, a GC developer can greatly improve the efficiency, performance, security, quality, and scalability of a software application.