Pedzisa mutsara unotevera: Berni akatumidzwa kuSwitzerland U20 national team nokuda kwe
2018 World Junior Championships. Akatamba mitambo mishanu, asina kuwana poindi. Akaita zvekare timu ye2019 World Junior Championships, achitamba mitambo yese minomwe (2 inobatsira) kubatsira Switzerland kupedzisa 4th mumutambo. Berni akatumidzwa kuchikwata che2020 World Junior Championships, mwaka wake wekupedzisira wekukodzera.