Android Application Developer

I am looking for developers having experience in android application for google phones. The application should be able to detect a wifi connection and if it is available, it should allow users to send an SMS through wifi connection, instead of using carrier's channel. (I am not sure if we need to setup a web server for that. If needed, a webserver needs to be setup on my host which will perform wifi2sms transactions). Application interface should look like any other SMS sending application. It should be supported on all Google phones and conform to the quality standards proposed by google marketplace. Its installation should be automatic. And if needed, setup files should be provided. Quality is the most important parameter. I will choose a developer who assures me that quality is upto the standard even if his bid is higher than others.