Not exactly what you asked for but something in a similar vein are profession-specific Reddit forms. I'm not sure they fully qualify as professions but I've found these two regularly odd and insightful:

- https://old.reddit.com/r/InstacartShoppers/

- https://old.reddit.com/r/McDonaldsEmployees/

I guess you could also add these to the list:

- https://old.reddit.com/r/smallbusiness/

- https://old.reddit.com/r/TalesFromRetail/

I'm always looking out for curious little subreddits like these that give you a glimpse into a different way of living or working. If anyone has any other recommendations, please share.