My experience was a 3 step process.
Fermilab has an Approachable management team, pleasant conversation.
Candidate can Expect a behavioral interview approach (tell me about a time when you...)
Detailed discussion of job content, position description, and Benefits overview. Competitive Benefit offering.
Process
Hiring Manager & Technical Recruiter
HR Director
Lab Director (executive)
Required to interview with Lab (Executive) Director.
Allow plenty of time for interview, parking can be a challenge.