Mitrea qualified for the men's K-2 200 metres at the 2012 Summer Olympics in London, by finishing fourth from the 2011 ICF Canoe Sprint World Championships in Szeged, Hungary. Mitrea and his partner Bogdan Mada paddled to a fifth-place finish and thirteenth overall in the B-final by approximately ten seconds behind the Belgian pair Olivier Cauwenbergh and Laurens Pannecoucke, recording their slowest time of 46.495 seconds.