Bang was an intern and working as a Credit and Corporate Banking Analyst at Credit Lyonnais Vietnam in 1996. He was an intern of the Ecole Nationale d’Administration in 1997 and 1998 at the Cabinet of the Préfet des Ardennes (Préfectures des Ardennes, Champagne Region, France.) He also gained experience when working for AXA Investment Managers Paris as a graduate summer intern in the Fixed Income Division.