At the 2003 FIS Nordic World Ski Championships, he won a gold medal in the team large hill event. At the 2004 Ski-flying World Championships event, he won a bronze medal in the individual competition and a silver medal in the team competition. Kiuru also earned a silver in the team competition in 2006.
Kiuru had problems with getting used to the new weight index rule that was introduced for the 2003-4 season. At first, he gained weight to get permission to use longer skis, but later decided to slimmed down to use shorter skis.
He also won a silver medal in the team large hill event at the 2005 FIS Nordic World Ski Championships.
Kiuru proved that he is still in good condition by winning the Finnish Championship gold medal in the Individual Large Hill competition. He also won a silver medal in the team large hill event at the 2006 Winter Olympics in Turin.
His ski club is Lahden hiihtoseura.