If they like you, they will reach out for a panel interview with engineering manager as well as many engineering leads. They will take turns asking you questions about your experience.
I applied online. The process took 4 weeks. I interviewed at Peterbilt (Denton, TX) in Feb 2019
Interview
Fairly straight forward interview process so go in with confidence. The behavioral interview was run of the mill and the technical panel kinda just digs your brain. It also helps if you were in Formula, SAE, Baja, etc... in college.