In 2016, the family returned to New Zealand to live in Kaeo in the Far North where he attended Kerikeri High School, playing for their Condor 7s team.

[6] Williams caught the attention of Crusaders' scouts, leading him to decide to move to Christchurch at the end of 2019 to join their highly successful academy.

[4] He was named in the Crusaders squad for the 2021 Super Rugby Aotearoa season, making his debut that year, with the team going on to win the Championship.

[7][8][3] On 24 November 2020 Māori All Blacks coach Clayton McMillan named his squad to play Moana Pasifika on 5 December, which included Williams for the first time.

[13] Williams appeared for the All Blacks in his first Rugby World Cup match on 29 September 2023 in the Pool rounds against Italy at OL Stadium, coming on in the 49th minute as a replacement for Ofa Tuungafasi.