At the 2007 World Cross Country Championships he finished fourth in the senior race, while the Kenyan team of which Ngatuny was a part won the team competition. Ngatuny won the 2008 Kenyan World Cross trials, and at the 2008 World Cross Country Championships he finished seventh individually and won another team gold medal. He won the 2009 Sapporo Half Marathon title with a time of 1:00:39.