Ramsfjell was the skip of the Norwegian junior men's team in four straight World Junior Curling Championships from 2016 to 2019. At the 2016 World Junior Curling Championships, Ramsfjell led his team of Bendik Ramsfjell, Magnus Vågberg, Elias Høstmælingen and Eskil Vintervold to a 5-4 round robin record, missing the playoffs. At the 2017 World Junior Curling Championships, his team improved to a 6-3 round robin record, which put them in a tiebreaker game against Canada's Tyler Tardi rink for the final playoff spot. They beat Canada in the tiebreaker game, but lost to Scotland's Cameron Bryce in the 3 vs. 4 game. This put them in the bronze medal game, where they faced Scotland again. This time, they would beat the Scots to claim the bronze medal.