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I joined because I'm interested in John's Category Theory course. I'm a systems engineer who has worked in large printing system and transportation system development.
Probably the closest I've come to something like Category Theory (which isn't very close, as best I can tell) is to occasionally use Unified Modeling Language to help with requirements analysis or design.
The aspects of CT which most interest me at this point are its ability to tie together various domains, to represent concepts graphically, and to potentially be useful in my work.
I also hope that it can help me better learn and communicate technical info generally.
Finally, my stretch goal (we can all dream:-) would be the ability to understand 51% of what John writes on his wordpress blog.