Not had a good look so dont know if this is still open,
http://www.redbullracing.com/cs/Satellite/en_INT/Article/RED-BULL-RACING-BEGINS-HUNT-TO-FILL-ULTIMATE-SUMMER-JOBS-021243173364527
Good fun just to take the test...
http://www.redbull.co.uk/cs/Satellite/en_UK/Sports/F1-Internship-Details/001243167922968
http://www.redbullracing.com/cs/Satellite/en_INT/Article/RED-BULL-RACING-BEGINS-HUNT-TO-FILL-ULTIMATE-SUMMER-JOBS-021243173364527
Good fun just to take the test...
http://www.redbull.co.uk/cs/Satellite/en_UK/Sports/F1-Internship-Details/001243167922968