I've managed several thousand employees in the last decade. I've had a handful that identified themselves as witnesses. From experience, they were no different than any other employees. The only exception I've had experienced was their attendance. I've had to fire a few for poor attendance. I've also noticed an expectation that I should make special allowances for them in regards to days off. I'm usually very flexible and almost never deny requests, but I do ask for three weeks notice. I had one young man ask for three months off because he was going to be missionary next week. Really? You want three months off and only five days notice? I never tell any of them my history. I don't need to be accused of discrimination.
When I was an active witness during the 80's and 90's I would sometimes work with the brothers. They never paid me. I would mow yards, and help wax the floors of their accounts. I guess they were testing me for Bethel service. When I was in my late teens I worked overnights stocking shelves. I worked with three brothers from various congregations in Ft Myers. During our hour lunch, what came out of their mouths was more vulgar than most. All three were active and regular publishers.