Hiring internally... I would recommed not allowing serious internal candidates to interview external candidates. They all too often sabotage, or outright veto,

Hiring internally... I would recommed not allowing serious internal candidates to interview external candidates. They all too often sabotage, or outright veto, every such threat to their promotion. This may be awkward, because they may know most about the technical details of the role. I would also exclude anyone who thinks they should get the job, when they are already ruled out, ab initio. In fact, especially exclude them, because they have precisely the inflated ego and expectations that might trigger a veto.