I've been keeping an eye on this too and haven't found any opportunities in my area. There are a few listings throughout the US.
http://www.indeed.com/jobs?q=windows+mobile+c%23&l=United+states&start=10
First of all, kudos for your app!
I for a long time used ClickMonitorDDC to control the external monitor's brightness, but switched a couple of months ago to Monitorian , mainly because it is an open source Store app. Could perhaps your new endeavor and this join forces?
Since Microsoft started embracing OSS more Visual Studio brought a lot of tools for cross-platform development, you can check this blog post about setting up MinGW on VS. You can also debug your programs on a Linux environment inside Windows with WSL/WSL2.
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>But it seems that Windows is much like Java, i.e., the vendor's own
documentation is almost always the best. Do you have any
recommendations for "must-read" blogs?
YES! Microsoft's documentation is very rich. You'll find yourself looking at it a lot.