Hello Sir.
I have 4 experience years in iOS development, and actually I do not develop a Mac application before (for get a project, someone can say anything, but I want to say the truth).
There are many similarities between iOS and Mac application development, and I can learn fast to develop the application for you.
I am studying post master program in the Netherlands now, and my program focuses on how to design a good software system, so in the end you will receive not only a software, but also a software which is ready for further extensions.
If you have any question, please let me know.