He played junior football for the Papatoetoe Panthers, Mangere East Hawks and Counties Manukau Stingrays before being signed by the New Zealand Warriors.

[9] Maumalo admitted he almost finalised a mid-season move to the St George Illawarra Dragons in May last year, before the Warriors blocked it and instead re-signed him through until the end of 2018.

[11] On 19 July 2019, Maumalo was ruled out of Friday night's game against the Cronulla-Sutherland Sharks due to a concussion sustained the previous weekend against the Broncos.

[12] Despite the sacking of Stephen Kearney after the New Zealand Warriors had a streak of poor performances, Maumalo continued his try-scoring form; ending Round 11 with 5 tries from eight games.

Hence, Maumalo flew back to New Zealand on 27 July 2020 among other teammates and is not expected to return for the remainder of the 2020 NRL season.

He played his final game for New Zealand in round 14 of the 2021 NRL season where he scored a hat-trick in a 42-16 loss against Melbourne.

[18] In his first full season with Wests Tigers, Maumalo was named one of five captains of the club, alongside James Tamou, Luke Brooks, Adam Doueihi and Tyrone Peachey.

The Sydney Morning Herald said, "Maumolo was seen as the biggest shock inclusion, especially given most fans view him as a softly-spoken winger, but the Tigers have been impressed with how much he has discovered his voice since he joined the club midway through last year.

[21] He played a total of 19 matches for the Wests Tigers and scored 12 tries as the club finished bottom of the table and claimed the wooden spoon for the first time.