At 16 years of age, in June 2015, he decided to amputate his left leg which was also damaged as a result of the infection.

[3] De Langen won a bronze medal at the 2017 World Para Alpine Skiing Championships at the slalom event.

[citation needed] In 2019, De Langen won a silver medal at the World Para Alpine Skiing Championships in the giant slalom event.

[4] In 2022, he won the bronze medal in the men's sitting super combined event at the 2021 World Para Snow Sports Championships.

[12] He won the bronze medal in the men's sitting giant slalom event at the 2023 World Para Alpine Skiing Championships held in Lleida, Spain.