He won the silver medal in the men's 200 metres T42 event at the 2016 Summer Paralympics in Rio de Janeiro, Brazil.

[1] Later that year he received his first set of blades from South African Charity Jumping Kids.

Mahlangu represented South Africa at the 2016 Summer Paralympics held in Rio de Janeiro where he won the silver medal in the men's 200 metres T42 event at the age of 14.

[2] At the 2017 World Para Athletics Championships in London, United Kingdom, he won the silver medal in the men's 200 metres T42 event.

[8] Mahlangu won the gold medal in the men's long jump T63 event at the 2020 Summer Paralympics held in Tokyo, Japan, setting a new world record of 7.17 m.[9][10] He also won the gold medal in the men's 200 metres T61 event.