[1][2][3] Alaimalo debuted for Northland during the 2016 Mitre 10 Cup and immediately became a key figure for them, starting all 10 of their championship games, scoring 2 tries in the process.
[4] Alaimalo was named in the Chiefs squad ahead of the 2017 Super Rugby season.
[1] In November 2020, it was announced that Alaimalo would be moving to the Highlanders after being granted an early release from the Chiefs.
On 11 December 2023, it was reported that he had signed for the Wests Tigers in the NRL.
[5] On 29 October 2024, Alaimalo departed the Wests Tigers and moved back to rugby union.