He was in the crew that won the gold medal at the men's eight competition at the 2012 Summer Olympics in London. At the 2016 Summer Olympics in Rio de Janeiro, he rowed in Germany's Men's eight which won the silver medal. Those nine 2016 Olympic silver medal rowers were awarded the Silbernes Lorbeerblatt (Silver Laurel Leaf), Germany's highest sports award, for their achievements. It was Kuffner's second such award having been similarly recognised for his 2012 Olympic gold.