There are a number of advantages to hiring a PrimeFaces developer. First, PrimeFaces is a very popular JavaServer Faces (JSF) component library, and so hiring someone with experience using it can give you an edge in developing JSF-based applications. Second, PrimeFaces developers tend to be very familiar with web application development in general, and so can bring a wealth of knowledge and experience to your project. Finally, because PrimeFaces is open source, you may be able to save money by hiring a PrimeFaces developer rather than buying a commercial JSF component library.