Two one hour long interviews. One with the manager then another with the mentor. Both back to back and done virtually. One 30 min phone screening before that. Overall very straightforward process for an internship. They keep you notified of your status.

After applying at a job fair at school, I was called a few weeks later to come in for an on site interview. The interview started with the HR rep and was followed by bringing in an engineering manager. The conversation was casual and not intimidating, which led to a tour of the facility. A week after the interview I was called back for a second interview which was very brief, then given forms to fill out required for hiring at the company.