Hi I've expertise in DBMS(Oracle, MS SQL, mysQL), magento,wp ,joomla, ASP.Net MVC,WCF and asmx services , PHP, Client side(JQuery Prototype).
I 've worked on such projects many times, create API SOAP and RESTFUL(JSON or XML), using 3-tier Architecture over different PHP frameworks and .net as well.
the job is to make an adminpanel and the API through which ur mobile app will communicate, is that OK? let me know if u r interested
I assume this is just API and admin work, no app or design work involve in it