Bitcoina and Ethereum wallet android development

I need an Android app. I already have a design for it, I just need it to be built. Hi Am looking for good android development team for my application. Read total description please.. After selecting team on my budget i"l provide you complete clear documentation for application. Concept application: I need to build bitcoin and ethereum wallet for Android users. In the application buy/sell options to users. User can buy bitcoins/ethereum with local currency and sell for local [login to view URL] also need perfect security system like google 2factor, email security login, mobile number security few options. Complete user friendly options like buy/sell, send/receive, security system Same like Coinbase and Xapo, Zebpay.. We think to lunch within two month. Development base on bitcoin core / API based that information we can discuss later.. Please bid if you know about blackchain technology and perfect api /core integration freelancers only. Thank you