I have extensive experience in development of applications for Mac/iOS platform using Xcode. In freelancer site I have completed development of below Mac applications
Simple RSA based mac application for viewing encrypted data
https://www.freelancer.com/projects/CPlusPlus-Programming-Objective-C/Simple-RSA-examples-Objective-three.html
Creating Dynamic library in Mac platform
https://www.freelancer.com/projects/Software-Architecture/Convert-Windows-Project-MacOSX-Xcode.html