 In 2001 Brattaberg received his first engagement as a soloist at the Staatstheater Mainz, 2005/2006 he was a member of the ensemble at the Bern Theatre.Rúni Brattaberg was engaged at the Theater Ulm from the season 2006/2007 to 2007/2008, where he debuted as a doctor in Wozzeck under the baton of James Allen Gähres, in a production directed by Matthias Kaiser.In Ulm he was still to be heard and seen in the following roles