Hiring a Message Queuing developer brings a multitude of advantages to your organization. Firstly, they can help you build a robust, scalable, and asynchronous communication system, which is crucial for handling high volume transactions and ensuring system reliability. They can implement a mechanism that allows different parts of a system to communicate and process operations asynchronously, preventing system slowdowns or crashes during high traffic.

Secondly, they can enable effective load balancing. By distributing messages evenly across servers, they prevent overloading and minimize system latency, leading to optimized performance.

Thirdly, their expertise can ensure fault tolerance. If a message fails to be processed, it can be returned to the queue or moved to an error queue, thus preserving data integrity.

Fourthly, they can provide system decoupling, making service upgrades or maintenance seamless without affecting the entire system.

Additionally, they can aid in streamlining the process of data synchronization between different services, ensuring consistent and up-to-date data across the system.

Lastly, with their knowledge of security principles in message queuing, they can implement secure data transmission protocols, safeguarding your system from potential security threats.

Hence, a Message Queuing developer can significantly enhance your system's efficiency, reliability, flexibility, and security.