Working in Antarctica is tricky unless you are a citizen of one of the countries under the Antarctic treaty and have skills that they need at your nations base.
Antarctica belongs to nobody but an agreement was was made in between nations to preserve the continent for scientific research. A number of nations have active bases and claims there: www.antarctica.ac.uk/About_Antarctica/Treaty/
I was able to join a mission to Antarctica last year with Robert Swan. We had people from 22 nations with us to build an Education Centre in Antarctica - it wasn't paid work, but if you really want to go, it shows that it is possible. Check out www.2041.com
for more info on the mission I joined.