It really depends on the institution. You may be able to get into grad school at the same institution, even working in the same lab, but you wouldn't be able to

It really depends on the institution. You may be able to get into grad school at the same institution, even working in the same lab, but you wouldn't be able to keep the job and get a degree at the same time. I'm sure that in theory it's possible to do part-time PhD work, but I've never seen it. I've seen people work for a Pharma company and get a masters at the same time, but not a PhD. On the other hand, I've known good staff researchers who've been told that while they'd be perfectly capable of getting a PhD, they wouldn't be able to get into the grad school where they worked. Unless there was some kind of already established program, I couldn't seen how you'd be able to effectively do it part-time. Maybe you could get a Masters part-time, and then move to a PhD program, but it would take longer.