He represents Stjørdals/Blink. Alseth debuted as referee in Tippeligaen 18 August 1996 in Skeid's 3–1 victory against Stabæk.
On August 18, 1996, Alseth officiated his first game in the Tippeligaen, where Skeid won against Stabæk with a score of 3–1. He represented Stjørdals/Blink during this match.