Das ist nicht meine Baustelle. — That is not my construction site. It is not my area.
über jemandes Kopf hinweg — over someone’s head, without asking or informing that person
hineinregieren — to govern into something, to interfere from outside in an unwanted way
federführend — holding the pen, having the lead responsibility, as in das federführende Ministerium
der Zuständigkeitsbereich — the area of responsibility
das Silodenken — silo thinking
der Bereichsegoismus — departmental selfishness