You should develop c#, android client.
And must connect with Bitfinex, hitbtc, Bittrex, Yobit, [url removed, login to view] api (http or websocket).
1) scrap bitcoin price data
2) implement market buy and sell
3) changable auto trading logic in fluently.
4) c# in WPF, android in Native.
I will support ApiKeys and SecretKeys, and ui design images for you to develop.
If you have some experiences about these apis, please contact me.
i will talk with you more details about project in chat.