Initial talk with HR; Phone screen with potential manager to discuss qualifications and fit; half-day in-person interview with 7 people (potential colleagues, managers, QA engineers, VP of engineering); take-home coding challenge.

I applied though a college career website and got an on site interview at school. Had a group interview with a phd student and two Turnitin employees. They were super nice and easy to talk to. Then I got an email asking for an onsite interview where I had three other interviews. Some of them I sat in an office and talked to other employees from different parts of the country. My rejection email basically told me that the team really liked me but I didn't have enough relevant courses.