 Although primarily a central defender, when needed he operated as a right back.Maftei was formed at Rapid București, where he became a key part of the team, winning one league title in 2003, one Romanian Cup and one Super Cup in 2002.In 2004, following the departure of Adrian Iencsi, he was appointed captain and won two Romanian Cups in a row in 2006 and 2007 and one Super Cup in 2007.