[3] Faiva made his senior debut for Waikato in a Ranfurly Shield defense against Heartland Championship side Horowhenua-Kapiti in July 2013, aged just 19.

He subsequently played all 20 of Waikato's Premiership matches across the 2015 and 2016 seasons, 17 of these appearances came from the start and he also added 2 tries to his career total.

[12] On 17 November 2023, Faiva was signed by English side Bath with immediate effect on a undisclosed length deal, back in the Premiership Rugby.

[14][15] On the 14 October 2021, he was selected by Alessandro Troncon to be part of an Italy A 28-man squad for the 2021 end-of-year rugby union internationals.

[16] On the 31 October 2021, he was selected by Kieran Crowley to be part of an Italy 34-man squad for the 2021 end-of-year rugby union internationals.