I never did Computer Aided Design, but I worked extensively with Geographic Information Systems.
I worked with ArcView and ArcInfo mapping software, from the early nineties command line versions to the full GUI ArcEdit ver 9+ until I retired 4 years ago. I did a lot of work with image processing back in the '80s, on a now defunct system called IDIMS (Interactive Digital Image Manipulation System).
Was it you who once posted here for advice on careers in GIS? I once recall talking with someone on this forum about it. If so, how did that work out for you?