I am a windows developer, I write c#/wpf applications and also develop PhoneGap apps. I work with angaurjs and javascript when projects require.
I can write a native windows 10 application and a c# (not java) push service hosted on a Microsoft azure service if this is ok.
I have quotes high as I don't know much about the application, but will re-quote if it is a lot simpler once I understand a bit more.