Her father Magnus Roosmann is a Swedish actor,[2][3] and her mother Elisabeth Guttormsen (née Ekstam) is a costume designer.
[4] After her parents divorced, Roosmann moved to Langesund, Norway when her mother remarried to Guttorm Guttormsen a Norwegian theatre musical director, composer and jazz musician.
Her first role as a screen actress was "Female friend" in a Swedish drama, romance short film, Dimmiga dar (Foggy Days, 2018).
[1][5] After graduating from Stockholm University of the Arts (2019), Roosmann continued her acting career by joining the ensemble at The National Stage, Bergen (Den Nationale Scene, DNS).
[6] In television Roosmann has starred in the Swedish action thriller Maskineriet (The Machinery, 2020, 2022) as Monika, playing opposite Kristoffer Joner across two seasons.