I had a friend reach out to a Senior Process Engineer who forwarded my resume to the hiring manager. After two weeks, I received an email from HR about scheduling a 4 hour on-site interview. There were about five 30 minute individual interviews, 4 with the engineering team, 1 with HR and one plant tour. Engineering interviews were good. I was briefed on the position, and had the opportunity to ask a few questions. I was told that some of the technical questions were asked to "pick my brain" and figure out how I think and problem solve. No calculation or on paper questions to solve. HR had a few behavioral questions, but also discussed paperwork, benefits, salary etc...