I used ps / gs quite a bit for a few years as part of work early in my career... 20 years ago. I rather enjoyed it.

I had always hoped I could work more in that area later on... like either writing printer drivers, printer firmware, work at artifex/ghostsript, etc. Unfortunately though, it seems like employers really don't hire for specific skills/domains like that, they just hire generic embedded / software developers and put them to work on postscript or whatever else they have after the fact. Oh well.