Write an Android application

Internet of Things: I am looking for someone who has experience building IoT application. I would like a smart home app developed. The app needs to work with hardware such as smart switches, lights, security system, power points etc. These appliance have Zigbee/IR modules. So basically I should be able to control all these appliances from my mobile app ( turn them on or off and would also like to see their state - whether they are on or off). The communication has to be two way i.e from app to appliances and from appliances to app. All the appliances will communicate with the app through a Zigbee gateway ( which in turn communicates through wifi modem)