From the village of La Punt Chamues-ch, near St. Moritz in the canton of Graubünden, he made his World Cup debut in November 2006 and won his first race in December 2011. Viletta competed at the 2010 Winter Olympics in Vancouver and at the World Championships in 2009, 2011 and 2013. He won the super combined at the 2014 Olympics in Sochi.