In organizations sometimes we refer to the manager of a manager as the "grandfather".
For example "candidates for senior level positions must go through a grandfather's interview" meaning those candidates must be interviewed by the hiring manager's manager.
Is there another way of saying this that is more neutral with respect to gender and isn't awkward "manager's manager" or weird "grand-boss"?
I've thought "Überboss" or "grand-manager" or something, but these seem a little too contrived.