|Date of birth||2 January 1987|
|Place of birth||Hannover, West Germany|
|Height||1.74 m (5 ft 9 in)|
|2007||→ SC Paderborn (loan)||18||(0)|
|* Senior club appearances and goals counted for the domestic league only|
Born in Hannover, Halfar joined his hometown club's youth ranks in January 2001, and progressed to the senior squad list for the 2004–05 season. He made his Bundesliga debut on 29 January 2005 in a 1–0 win at Arminia Bielefeld. His time since has twice been blighted by torn cruciate ligament injuries, although he has managed a handful of first team appearances in each season since his debut.