He is best known for his character design work on the Studio Ghibli films Kiki's Delivery Service and Ocean Waves, as well as the PlayStation game Jade Cocoon.
After graduating from high school, he began working for Osamu Dezaki and Akio Sugino at their Studio Annapuru.
He then worked as a free agent on such shows as The Mighty Orbots, Rainbow Brite and Disney's Adventures of the Gummi Bears.
Kondō collaborated with Ken'ichi Sakemi on a manga retelling of the Joan of Arc story, as well as doing the character designs for the Jade Cocoon video game series.
In 2007, he was announced as the supervising animator of the Studio Ghibli film Ponyo on the Cliff by the Sea.