Skriv noget Software

We have a Web browser point of sale system wich it works on chrome browser. we also had the app in android and ios .but we had problems with update on all app therefore we would like someone develops a chrome app that can be opened and installed on android - ios - windows.   here is detailer for app 1- choose country 2- receive notification in the app from pubnub and play sound. 3- Camera sensor in the app for when you hold your finger on camera on phone or tablet screen turned off but still when you remove your finger from camera the app turn on the system in samme spot you was before so you donot need to log in again to the system. 4- if it is possible to have sdk for star print tsp 143 in the app in case we want to print from the app.