Hiring an IBM Websphere Message Broker developer is beneficial as they have the expertise to create, deploy, and debug message flows in your system. They can ensure seamless communication between different applications, reducing the complexity of your IT infrastructure. They can also transform and enrich in-flight data, providing useful insights for business decisions. Their knowledge of ESQL, Java, or .NET allows for efficient data mapping and transformation. Furthermore, they can help in improving your system's performance, reliability, and scalability, ultimately leading to enhanced business productivity.