Among her graduating classmates were Taavi Eelmaa, Ain Prosa, René Reinumägi, Indrek Saar, Tarvo Sõmer, and Ardo Ran Varres.
[1][2] In 1996, shortly after her graduation from EMA Higher Drama School, Tammaru began an engagement as an actress at the Rakvere Theatre.
[3][4] Some of her most notable performances at the Endla Theatre include roles in such works by authors and playwrights as: Kaite O'Reilly, Urmas Vadi, Anton Chekhov, Maurice Maeterlinck, William Gibson, Donald Bisset, Ervin Õunapuu, Wajdi Mouawad, Bengt Ahlfors, Sacha Lichy, Andrus Kivirähk, Gustave Flaubert, Joanna Owsianko, Tiit Palu, and Nikolai Gogol, among others.
In 2011, she appeared as Director Jaaksoo in the Katrin Laur directed Estinfilm drama Surnuaiavahi tütar, about the disintegration of a rural family.
The same year, she played the role of Natasha in the Tapio Piirainen directed Finnish feature-length television crime-drama film Bodomin legenda for Yleisradio (YLE).