He made his international debut at the 1989 Southeast Asian Games in Malaysia at the age of 17.

In the 2003 Southeast Asian Games in Vietnam, he was part of the men's 4x100m relay team that won silver.

He was national relay coach for Singapore from 2006 to 2010,[3] a role he assumed again between 2017 and 2019;[citation needed] the 2009 men's 4x100m team took silver at the Southeast Asian Games, becoming the first Singapore team to clock below 40s.

[4] He is coach of Mark Lee, who at the 2022 National Schools Track & Field Championships broke the A Division records for the 200m[5] and 100m.

[6] Hamkah's daughter, Haanee Afik, participated in the 2019 Southeast Asian Games in Manila as part of the women's 4x100m relay team.