in the René Vilbre directed children's fantasy film Väikelinna detektiivid ja valge daami saladus. In 2015, Oja appeared as Sanitar Elmar 'Säinas' in the Elmo Nüganen directed war film 1944 for Matila Röhr Productions (MRP) and Taska Film. Set in World War II, the film is shown through the eyes of Estonian soldiers who had to choose sides and thus fight against their fellow countrymen. It was selected as the Estonian entry for the Best Foreign Language Film at the 88th Academy Awards but it was not nominated. The following year, he appeared as Siim in the Toomas Hussar directed political thriller Luuraja ja luuletaja, starring Jan Uuspõld. In 2017, it was announced he would appear in the Kaur Kokk directed period drama Põrgu Jaan. In 2018, he appeared as the title character in the Ari Alexander Ergis Magnússon directed Icelandic-Estonian drama Mihkel opposite Tómas Lemarquis and as the character Ott in the Siim Tamm directed drama-thriller Hölma All. In 2020, Oja had a starring role as Rupi in the Veiko Õunpuu directed joint Estonian-Finnish comedy crime-drama Viimased, shot on location in Lapland. The film was selected as the Estonian entry for the Best International Feature Film at the 93rd Academy Awards. The same year, he appeared in the role of Peeter Parik in the Margus Paju directed World War II spy film O2. In 2023, he appeared as Ivo in the Ergo Kuld directed comedy film Suvitajad. Oja has also worked as a voice actor, dubbing foreign animated films into the Estonian language. In 2013, he lent his voice to the Estonian dubbing of the Canadian-American 3D computer animated science fiction-comedy film Escape from Planet Earth (Estonian: Põgenemine planeedilt Maa). Television Between 2014 and 2015, Pääru Oja had a recurring role as Markus Heng on the popular TV3 comedy-crime series Kättemaksukontor. In 2018, he began a starring role as Alex in the TV3 crime series Lõks. In 2020, he had a recurring role as Matti in the Finnish television crime series Cold Courage. In 2021, Oja was cast as the character Arne Gormsson in the Netflix historical action-fiction drama television series Vikings: Valhalla. Radio In 2016, Pääru Oja was one of 77 Estonian actors to honor the 400th year of William Shakespeare's death with the radio series "154 Sonnets of William Shakespeare" on Estonian Public Broadcasting stations Vikerraadio, Klassikaraadio, and Raadio 2. All sonnets were translated into the Estonian