Over the years I've worked with numerous robot techs. It could be a very demanding job because there's quite a bit of traveling involved mostly at a moment's notice at some ungodly hour of the night.
It's real nice (not) to be in a construction trailer in Gary, Indiana talking to your wife 600 miles away when she tells you that your little daughter made her first steps that day.
Many robot techs bail out after a few years and slide into a nice job at one of the customer's operations because they'll find out about a job opening before most other people. It's nice to hire an ex Fanuc guy when you have 53 of their robots.
There's almost always a job opening for a service tech at most robot companies.