creating an APP that can control a WIFI module by using GPIO commands

I need to create a simple mobile app with 3 buttons and to able to control the 3 GPIO commands of a WIFI module. I already have developed the WEBSITE that is hosted on server, but I need this to operates this WIFI module from the same phone instead from server. this is for controlling the WIFI module directly and not going through the hosting server. for further questions please contact me and also discuss about project and price!