Too Long; Didn't Read
Interviewing, and being interviewed for that matter, can be a stressful event. You approach this situation with the same focus and zeal you do a new technology or project. The interview is not the time to work through a checklist, the candidate has probably taken time off from work to meet, do them a favor and ask engaging questions. The following (short) list of questions is a conversation starter. Ask them about themselves, as well as their role and how they view their duties. Ask a practical question, present them with a common challenge that is faced by someone in this role.