tenured

would be the expression

Civil servant appointed for life or career civil servant

"tenure" applies mainly to university professors IMO.

my girlfriend is a teacher, and not at a university; she's tenured, so it's nothing to do with university professorship

New York City public school teachers can achieve tenure.

Don't get so damn antsy. I just wanted to point out that civil servants and also Supreme Court Justices are not "tenured", they are appointed. :-))

gemeint ist damit ein Lehrer - sez the OP