However, a number of the tips are all about Apple development such as whether the developer has experience with Objective-C coding, and Xcode tools. And he warns against the over use of open source frameworks.
http://iosdeveloperforums.com/threads/looking-to-hire-ios-developers-ipad-iphone-application-development-team.555/
http://www.xda-developers.com/announcements/iphone-developers-officially-launches/
http://www.zdnet.com/blog/apple/how-to-hire-a-savvy-ios-developer/9747
http://answers.oreilly.com/topic/2292-how-much-does-it-cost-to-develop-an-app/page__gopid__38779&#entry38779
http://iosdeveloperforums.com/threads/looking-to-hire-ios-developers-ipad-iphone-application-development-team.555/
http://www.xda-developers.com/announcements/iphone-developers-officially-launches/
http://www.zdnet.com/blog/apple/how-to-hire-a-savvy-ios-developer/9747
http://answers.oreilly.com/topic/2292-how-much-does-it-cost-to-develop-an-app/page__gopid__38779&#entry38779