He currently plays for the Brisbane Premier side GPS and also Tonga.
Fainga'a will debut as a rugby union coach in 2016 when he takes on the position of head coach for the UQ Women's first XV team.
The Fainga'a's are of Tongan, English and Italian descent.
After leaving school he played rugby league, most notably for the Canberra Raiders Jersey Flegg side in 2007 and Melbourne Storm under 20s side in 2008.
Fainga'a moved back to rugby union in 2011 playing for the University of Queensland Rugby Club before joining his older brothers at GPS in 2012.