One interview with a panel of people. There will be both technical and behavioral questions about your prior work history and what you have done there. For example, if a new graduate, questions about the models you used in research, etc.
I applied through a recruiter. The process took 5 weeks. I interviewed at Booz Allen Hamilton (South Bend, IN) in Oct 2022
Interview
One screening call, then one hour-long interview with three members of the team, then offer discussion with the recruiter the week after. Very resume based, not so much technical questions and no case studies.