careerist

/K ER0 IH1 R IH0 S T/
noun
  1. 1

    A person who pursues the advancement of their career at the expense of other values.

  2. 2

    A person who takes a job, especially in the military, for a long time rather than temporarily.

adjective
  1. 1

    Of or pertaining to such a person or way of life

Source: https://en.wiktionary.org/wiki/careerist