[Nursie]

Last time I got near any sort of proprietary unix was probably AIX at IBM. It is still actively developed for their p-series POWER servers. But that was probably 7 years ago now.

Back in the 00s it was common to have to work on multiple proprietary platforms. I did a lot of platform engineering work for one product that ran across Solaris (Sparc and x86), AIX (POWER), HPUX (PA-RISC and Itanium), Linux (x86 and System Z) and Windows.

Now ... if I'm lucky I don't have to care about the platform at all, I just write lambdas in my language of choice and throw them at AWS. It's a very different world!