Jantjie was from Whittlesea, Eastern Cape. He first played for Mbombela United between 2015 and 2016. He soon signed for PSL club Free State Stars. In his three seasons with the Free State Stars, he scored eight goals in 63 league appearances. At the time of his death, he was set to play for PSL side Bidvest Wits from the 2019–20 season onward.