Brattsveen has many good placings in the Biathlon World Cup. He was a member of the Norwegian elite biathlon team from the 2008–09 season to the 2009–10 season, and again in the 2012–13 season. He did not, however, have any World Cup starts in the 2012–13 season because of the TWAR virus. Further illness meant no starts in the 2013–14 season either, and after that season Brattsveen decided to retire.