Hi George,
I am new to freelancer but have over 2 years of industrial experience of developing android apps. I have worked with apps featured with rest/soap web-services (for user authentication, fetching and displaying data, etc), UI integrated app screens compatible to almost all mobile/tablet devices, use of UI components such as navigation/sliding drawer, tabs, swipe tabs, view pagers, etc. also integrating Google, social media, and third party libraries.
If you think that I am the guy you are looking for developing your app than please provide me more details about your app so I can provide you a detailed task estimation.
Thanks for your time and consideration George.