Right now, we have professionalism and profession, but I'm not sure that they should be two separate tags. Between them, there are only 32 questions (18 in professionalism and 14 in profession). I, personally, prefer professionalism - it includes a variety of topics ranging from the development software engineering as a profession to ethics and can be used to denote things that are of interest exclusively to professionals in a work environment. I think that professionalism, by nature, includes everything in profession. But thoughts?
profession is a meta tag and just needs to be burninated from all the questions that have it. It has no semantic value, and it's not the same thing as professionalism: it should not be merged into it.
I looked at the professionalism and didn't find a question there that needed the tag and was on-topic here: many of the questions were general workplace professionalism questions, which are off-topic here (probably going to be okay on Professional Matters). Some had professionalism seemingly as an afterthought. Others mention professionalism, but are really about something else.
I went ahead and retagged most the questions that were on-topic, and professionalism can now be burninated.
There's also professional: there was only one question there that was actually on-topic and not a "please tell me what I should do" advice question. This should be burninated from all the questions that have it.
"Profession" seems like a meta-tag. After all, all questions here are ostensibly related to the software development profession.
I haven't looked closely at the professionalism tag yet, but I think that it makes no sense to keep "profession" regardless.
If profession is indeed a Meta tag as Anna suggests, I would recommend merging profession->professionalism and then manually reviewing the 30 questions, or reviewing the 14 profession questions and then merging. Either way, it's a small enough number for a manual cleanup followed by a merge or a merge followed by a manual cleanup.