Hexeberg took part in the Telemark Junior World Championship 2017 in Rjukan . There he finished 17th in the Classic and 31st in the Sprint. On the same weekend he made his debut in the Telemark World Cup in a parallel sprint in the same place , but was eliminated in the first round. In the following season he started regularly in this series of competitions and achieved 59th place in the overall World Cup with 21 points. At the Junior World Championships 2018 in Mürren , a ninth place in the classic competition was his best result.