He represents Stjørdals/Blink. Alseth debuted as referee in Tippeligaen 18 August 1996 in Skeid's 3–1 victory against Stabæk.
Alseth officiated his first match in the Tippeligaen on August 18, 1996, when Skeid defeated Stabæk 3–1. He represented Stjørdals/Blink during this game.