Hiring an ASMX developer is beneficial as they are skilled in creating web services using ASP.NET, enhancing your website functionality. They can create applications that communicate and share data, regardless of the platform or programming language. They provide solutions for interoperability issues, making your systems more adaptable. With their expertise, they can help in creating, testing, implementing, and maintaining web services, ensuring your business processes are smooth and efficient. Their knowledge in SOAP, WSDL, and other related technologies ensures robust and secure web services, adding value to your business operations.