Hello contentassassin,
I'm a professional software developer with 6 years of experience in building desktop database applications. I'm confident in getting your job done.
Since you state that you need a multi-platform solution (Mac and Windows), I suggest building your software with Java technologies. Java programs run on most platforms including Windows and Mac - this minimizes project cost greatly since the app is written and compiled only once.
To make your application modern-looking and user-responsive I propose developing the user interface with JavaFX technology (see my portfolio to get the idea of the design I'm aiming at).
You also mentioned MySQL under required skills which suggests you will need your app to connect to a database. This is going to be easily done through a MySQL jdbc driver which guarantees speed and security.
I hope you are interested in our cooperation as I am. If so, please send me more info about your project - I'd like to discuss it more and help you get the best out of it.
Kind regards,
Andrej Nadilo