Career
Born in Mo i Rana, Bjørnbak started his career in the local club Stålkameratene before he joined Bodø/Glimt ahead of the 2011 season. In his first season for Bodø/Glimt, Bjørnbak played 23 matches and scored one goal in the First Division, before he transferred to Haugesund where he signed a four-year contract. Bjørnbak made his debut in Tippeligaen in the match against Vålerenga on 25 March 2012, but he was sent off after 33 minutes when he fouled Marcus Pedersen as the last manitoba
Bjørnbak played a total of 17 matches for Haugesund in his first season.
Bjørnbak first Norway at international level when he played three matches for the under-17 team in 2009. In 2012, Bjørnbak again represented Norway when he played two matches for the under-21 team