[9] He made his debut for the Manly Warringah Sea Eagles in round 3 of the 2015 NRL season against the Canterbury-Bankstown Bulldogs.

[10] After playing on the wing in the opening two rounds of the 2016 NRL season, Wiliame was demoted to the Manly Warringah Sea Eagles' New South Wales Cup team to allow for the return from injury of fullback Brett Stewart.

[11][12] After 23 first grade games with Manly Warringah Sea Eagles, Wiliame was granted a release from his contract with the club on 9 November 2016 in order to take up a two-year deal with the Catalans Dragons in the Super League.

[14] On 17 December 2019, Wiliame signed a two-year deal to join St. George Illawarra starting in the 2020 NRL season.

[17] Wiliame was limited to only two matches for the New Zealand Warriors in the 2023 NRL season as the club finished 4th on the table and qualified for the finals.