Dear Sir:
I am mobile application developer working on iOS/Android native application I have 4 years experience in application development, many application live this time in app/play store, I am also share with you my portfolio.
Sir I have gone through your post you want android application with openvpn protocol, i have developed many vpn application with OpenVPN Protocol e.g (TCP/UDP) i have good experience in VPN Application i can provide you links of vpn app that are live and also can give you demo app So sir we can discuss about work in chat here, and if you need more info I will available here through chat,
check my Portfolio Sir.
Sir my all project included here see my profile, if you need proper links I will also provide you application links,
Thanks
Sanjay Kumar