Editing Wikipedia is done by volunteers. The sysadmin/operations staff is paid, and so are the Mediawiki developers building out stuff specifically for WP.
Old, former Wikipedia admin here. Unless things have changed, I would strongly advise against paid editing, nor would I allow an employee to directly edit any articles directly related to your company.
Are there any profiles of Wikipedia editors? I have to admit that they seem like another breed to me. I don't even bother editing Wikipedia, not that I ever did in quantity, just as I saw things. Everytime I have, even to correct some clear error, it is usually immediately reversed or removed altogether (things as simple as correcting the title of something). They have very strange conventions and their own Wiki language in terms of how the speak in comments and edit articles.
I've spent hundreds of hours editing Wikipedia and have come out really pessimistic about the whole thing. In fact, I'd say that everyone I know who's actually pessimistic about Wikipedia also have tons of hours of experience editing
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