Hello
I am a macOS system engineer, and I was working with this platform for over 10 years, starting as far as OS X Snow Leopard.
Please feel free to go through my portfolio, and I can share many more projects-examples of mine if you'd like.
One of the similar apps I created was a plugin for iPhoto for managing pictures and uploading them onto a custom service.
Another app was a video-player for Mac for dash cameras (that, apart from having a Quicktime player-like customized functionality, synchronously draws a car's position on a map and plots accelerometer's graphs).