I feel I can def pretty accurately tell whether somebody works a tech or some business/finance/marketing/HR job just by the way they speak. Like I talk to them outside of a work context, I make the guess, and then they later reveal what they do and I'm usually right if it's one of those 2 categories
is it an accent or is it just code switching (or failure to code switch)?
No it's a bit different than their work code switch