Uber made his debut in the Telemark World Cup on December 1, 2017 in Hintertux . By finishing ninth in the sprint, he immediately scored his first World Cup points. In the further course of the season he was able to classify himself regularly within the points and finish his first World Cup season in 28th place overall. He took part in the 2018 Telemark Junior World Championships in Mürren . First, on March 22, 2018, he won the silver medal in the mixed team parallel sprint and a day later the gold medal in the individual parallel sprint. At the age of 16 he set an age record for the youngest junior world champion in telemark skiing.