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 i can make 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 i can make this app in £400, this charges includes ui designing of your choice like nord vpn and and android app with two protocols e.g(TCP/UDP), 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