He has been a member of several musical groups, including Kuldne Trio and Bläck Rokit.[1]
He has hosted several popular television series, e.g. Kitsas king (1985–1987), the comedy ensemble Kreisiraadio (1997–2003), with whom he appeared as Estonia's entry with at the Eurovision Song Contest 2008, and Ärapanija (2003–2013). Oja has also appeared in a number of prominent roles in feature films.[1]