I have a B.S. in physics. I worked as an engineer for awhile and then landed in a PhD program doing computer science. There's better job opportunities here, (substantially) better pay, and I'm still able to work close to the science (doing HPC stuff).

I also have always liked computers, so the switch is a good fit for a lot of reasons. But I'll also say that it feels like a completely different world (same with when I worked as an engineer).