Looking for Rest JSON expert

Hi, I want to integrate the new UI design to my existing travel website using web services. Website Front-END is developed using php with smarty template framework. Back end is done using C#. All designs are well coded in XHTML, just use REST to work with web services and add the functionality of travel booking process. This is a long-term project, initially you would be working on UI, later in a month we need to change C# to php... Please ask me for any clarifications...