He started his professional career with the Norfolk Admirals of the American Hockey League.

They assigned him to the Lowell Lock Monsters in 2004–05 then to the Omaha Ak-Sar-Ben Knights for the 2005–06 season.

He played his first National Hockey League game on April 1, 2006, with the Flames against the Edmonton Oilers.

In the late summer of 2010, Germyn signed a two-year contract with EHC Olten, a Swiss National League B team, where he played alongside American-born Marty Sertich scoring 45 points in 36 games.

On June 18, 2011, Germyn was released from the final year of his contract to join the Straubing Tigers of the German DEL.