Modifying mobile app chatsecure.org (source code available)

i need you to modify the opensource mobile app based on jabber, it is [login to view URL] for both android and iOs and its full open source. backend server already installed(openfire server XMPP). basically i need you to: 1. modify the layout to make looks like usual IM(whatsapp,line,wechat) 2. make the apps running in the background. (now the apps only running in background for 10 minutes because of this [login to view URL] [login to view URL] to register for everyone 4. push notification is also already in source code.. so i need my app have this too. thats all i need for now.. i think its not that hard as the source code is already there and you need to modify and add some code to make it work as i describe above.