2016–18 During the
2016 season, at 19 years old, he made his first professional team debut when he came on as a reserve forward during the opening match against
Hawke's Bay at
McLean Park. Representing the Wellington under-19 team in
Taupō, Aumua was ordered back after
Leni Apisai failed concussion protocols in preparation against
Northland. He scored three tries in the fixture, making him just the fourth hooker to register a hat-trick in the competition's history. His performance at national age grade level in 2017 impressed Wellington head coach Chris Gibbes ahead of the
2017 Mitre 10 Cup, and he was subsequently renamed in the squad for their upcoming season. Aumua started well for Wellington, scoring three tries through the first three games of the competition. It saw Aumua place fourth-equal in the overall leading try-scorers with fellow
front rower and teammate,
Alex Fidow on seven tries each. Following his 2017 provincial campaign, Aumua was called up into the
All Blacks for the
2017 end of year tour despite the fact that he had not even made his
Super Rugby debut. He debuted for New Zealand alongside
Matt Duffie and
Tim Perry against the
Barbarian F.C. in November 2017, replacing
Nathan Harris off the bench in the 67th minute. Aumua was denied a potential try due to a forward pass from Hurricanes team-mate
Jeffery Toomaga-Allen, but the All Blacks still managed to beat the Barbarians 31–22. He also replaced Harris off the bench 10 days later in a midweek game against a
French XV selection, helping New Zealand win 28–23. Because neither of those fixtures was
tests, Aumua would still await his test debut. Aumua made his debut for the Hurricanes, against the
Canterbury-based side the
Crusaders, on 10 March 2018 during round 4 of the
2018 Super Rugby season. Aumua replaced
Ricky Riccitelli in the second half of the match, with the Hurricanes winning against the Crusaders 29–19. Aumua performed well in all four of his 2018 Super Rugby appearances but was ruled out for the rest of the 2018 Super Rugby season due to a fractured wrist sustained against the
Sharks during a narrow 38–37 victory in April 2018. Aumua's rehabilitation period was scheduled for 12 weeks. Following a wrist injury, Aumua appeared in Wellington's 31-man squad announcement after head coach Chris Gibbes released their premiership side in August 2018. He made his return to play for Wellington in week one of the
2018 Mitre 10 Cup competition against
Otago. At seasons-end Aumua appeared in their away semi-final, against Auckland and was re-called to the New Zealand squad to prepare for
Japan in November for the
2018 end of year tour. Aumua's re-call to the All Blacks unfortunately saw him fail to make the field, with Hurricanes Captain,
Dane Coles, returning from injury.
2019–21 Aumua rejoined the Hurricanes squad for their upcoming season after head coach
John Plumtree named his inclusion during the
2019 Super Rugby side announcement in October 2018. He made his first appearance of 2019 against the
Chiefs at
FMG Stadium Waikato on 15 March. Aumua picked up a concussion in the last minute of the Chiefs match and was rested for a week. Dane Coles' ongoing run of injuries saw Aumua start in most games of the Super Rugby season, with Coles eventually returning to captain the team in the playoffs. Aumua played well throughout early 2019, displacing
Nathan Harris from the New Zealand squad for the
2019 Rugby Championship. Aumua, however, failed to make his test debut during the competition, with the form of
Liam Coltman proving too strong. This saw Aumua as one of five players to be dropped, on 1 August, following a test against
South Africa. He scored a brace against
Waikato to help secure
Wellington a home semi-final with a bonus-point win. Aumua impressed in the inaugural game of the
2020 Super Rugby Aotearoa season after showcasing big tackles and charge downs. In round two, he scored the Hurricanes only try of the game against the
Crusaders after an offload from
Ngani Laumape to put Aumua in with just ten minutes to go to draw the game at 25 points each. With Dane Coles suffering a minor injury, made way for Aumua to make his first start in the competition against the Highlanders. In August, New Zealand Rugby and the Hurricanes secured a contract extension for Aumua through until 2023. After the
COVID-19 pandemic in New Zealand, it was confirmed an historic one-off
North versus South match was to be played in
Wellington with no fans. Aumua was selected to take part in the fixture, starting at hooker. The match was classed as a trial for players to be selected in the New Zealand international side. He was recalled into the side by new head coach
Ian Foster in a 35-man squad. Before being assembled for international duties, Aumua among other national players played in the
Mitre 10 Cup prior to travelling. He played in two matches for
Wellington in the first two weeks of the competition. After missing the first test in
Auckland, Aumua travelled to
Australia for the
2020 Tri Nations Series. He made his first test appearance against
Australia along with
Akira Ioane,
Cullen Grace, and
Will Jordan. == Statistics ==