[2] Mailata participated at the Papatoetoe Boxing Club of Grant Arkell, and fought fellow countryman Joseph Parker twice at the start of his amateur career.

Mailata competed throughout Auckland and fought at the AIBA Youth World Boxing Championships at Armenia in 2012 but was disqualified for putting his head lower than his Cuban opponent's belt.

[9] In 2016 Mailata missed out on qualifying for the 2016 Rio Summer Olympics after losing to Kazakhstan's Ivan Dychko at the Asia and Oceania Qualification Tournament.

[17] In late October 2018 it was revealed Mailata would turn professional after being announced as a feature on Shane Cameron's Counterpunch Fight Night in November at ABA Stadium.

[19] After signing a promotional agreement with Epic Sports and Entertainment in June 2019, it was announced he would make his United States debut in Las Vegas.

[21] The following month Mailata fought on the opening undercard bout of Cody Crowley versus Mian Hussain on UFC Fight Pass in Peterborough, Canada.