Since the year the Mac was born I have been developing software for Apple Macintosh. And, also since it’s been available, I’ve extended that to iOS (iPad and iPhone) and tvOS (Apple TV).
On the server side I use Java and related technologies for developing web applications and back ends for mobile applications.
I have built macOS, iOS and Java applications for many customers for in-house and commercial use. For larger projects, or when additional expertise is required, I call on the assistance of other professional developers and designers.