A word for someone who is concerned only about their career?

Solution 1:

The term is careerist:

noun ( often disapproving) ​

  • someone who thinks that their career is more important than anything else, and who will do anything to be successful in it.

(Cambridge Dictionary)

Usage examples

  • ‘Our celebrity driven news is presented by people who gave up being journalists and instead became careerists.’
  • ‘However, there are also a number of shameless careerists who inhabit New Labour, often former Tories.’

(ODO)