Stereotypical process: HR --> hiring manager --> on-site interview (panel).
Never heard back from them. Called after 2 weeks to the recruiter (Solar, not external) and 3 weeks to hiring manager with no call back. You would like to think they would at least send an email. They're response to my question "tell me more about the massive 2015-2016 layoffs" was not well thought out so that kind of scared me away. The place seemed very old and run down. Needs a facelift for sure. Still it is unprofessional to not let someone know they didn't get the job after they went on site.