No follow-up. Three weeks after my interview, I contacted the HR department to find out they had filled the position I interviewed for. I never heard anything back from the hiring manager, even though they said they would contact me 'either way.' Very frustrating.

1-2 behavioral interview rounds. 1st round may be through an external agency. 2nd round would be with full time members on the team. Online interview, about 30 minutes long. 2 interviewees with basic behavioral questions.