Bundu won his first major amateur medal at the 1997 Mediterranean Games in Bari, winning gold in the light-welterweight division. This was followed up with bronze at the 1999 World Championships in Houston. At the 2000 Olympics in Sydney, Bundu fought in the welterweight division, losing to Daniyar Munaytbasov in the second round. Bundu also represented his native Sierra Leone at the 2nd AIBA African 2004 Olympic Qualifying Tournament in Gaborone, where he won bronze in welterweight division.