simple iphone app (oauth2)

Hi. Everyone. I am looking for someone who can create my iphone app. Job is now very simple. Job description is following to: I have a website. My web developer has integrated oauth2 for authenticate and authorize the users. So you need to have knowledge for oauth2 and then implement login functionality using oauth2 client library for iphone app. Like I said, job is now simple. If you have any experience in this part, please bid. Thank you.