Hoffmann started in the Ski World Cup in March 1996 . He celebrated his first major success in 1996 when he became junior world champion in downhill skiing in Schwyz / Hoch-Ybrig . He achieved his best result at the World Ski Championships in 2003 in St. Moritz , where he came fourth in the Super-G. At the 2002 Olympic downhill race in Snowbasin , he finished eighth. At the 2006 Winter Olympics in Turin, Hoffmann made it onto the podium and won the bronze medal. One and a half weeks after this success, he suffered a cruciate ligament rupture in his right knee on February 28, 2006 during giant slalom training in Adelboden .
Hoffmann achieved six podium places in the World Cup, but no victory. The closest he came to a World Cup victory in March 2002 in the Altenmarkt-Zauchensee downhill race , when he finished second behind the Austrian Stephan Eberharter .
On March 9, 2012, Ambrosi announced his resignation due to a lack of results.