Theo Savidis started out his game related career as a writer for a Swedish PC games magazine in 1995. In 1999 he started working as a level designer at newly started o3games in Uppsala Sweden.
After completing the first title, The Outforce, a top down RTS in full 3D, the company merged with Starbreeze Studios and took that name. At Starbreeze, Savidis worked as a 3D modeler and QA on games like Enclave, Enclave 2 (canceled due to publisher insolvency), Knights of the Temple and Chronicles of Riddick: Escape from Butcher Bay. Leaving Starbreeze in 2004 he worked as a gameplay designer on Just Cause for Swedish game studio Avalanche and in 2005 he went back to Starbreeze to work as gameplay designer on their new game The Darkness.