Melleri attended Kallio Upper Secondary School and began acting at the Helsinki Theatre Academy in 2005, where she graduated with a Master of Theater Arts in the spring of 2011.

[1][2] In theater, Melleri has portrayed Lady Macduff's in the play Macbeth at Q-teatteri from 2008 to 2009[3] and Wendla Bergman, one of the main characters, in the musical Spring Awakening at the Helsinki City Theatre in 2009.

[5] Melleri has starred in five feature films, Young Gods (2003), Matti: Hell Is for Heroes (2005), Ganes (2007) and Vuonna 85 (2013), and another lead role, Siiri, in Sisko tahtoisin jäädä in 2010.

[7] Melleri has also acted on television, including the lead role in Yle TV2's 12-part series Rakastuin mä luuseriin (2005).

[8] From 2005 to 2008, Melleri was the singer of the band Gris and from 2001 to 2003, she hosted Yle TV1's youth magazine program Iines.