I applied online. The process took 1 week. I interviewed at IPG Photonics (Oxford, MA) in Jan 2018
Interview
Had a phone screen a day after I applied online. A week later I interviewed with HR, Engineer, and VP on site. The whole process took about half a day.
Easy applied online and it took a month to get a call back. Very easy interview, mostly STAR method. I interviewed with each department and get a call back from 2.