[3] 1992 (as a Light Welterweight) 1996 (as a Lightweight) In 1997, Doroftei turned professional, signing with the Canadian club Interbox.

On 5 January 2002 he won the WBA world lightweight title, winning in a thrilling split decision over Argentinian boxer Raul Horacio Balbi 112–115, 114–113, 115–112.

On 31 May the two fought again in Bucharest; this time, Dorin scored a knockdown en route to a clear cut unanimous decision victory, 118–111, 117–112 and 118–110.

A lightweight title unification bout on 17 May 2003 with American boxer Paul Spadafora, the IBF champion, ended in a draw, 114–114, 115–113, 114–115.

On 24 July 2004, Doroftei lost his undefeated mark when he tried to get the WBC title, getting knocked out with a body shot in two rounds by Arturo Gatti.