Birn studied at Teatterikorkeakoulu (Helsinki) between 2002 and 2007 and graduated in 2008. She is known for her many roles in well known nordic films films eg Lupaus (2005), 8 days to the Premiere (2008), Vuosaari (2012).
In 2013, Birn won the best actress for Jussi's film Puhdistus (2012). In the same year, he was awarded the State Prize for Cinematography.
In 2021 she began playing the role of robot Eto Demerzel in the series Foundation. The second season was released in 2023