He started karting in 2011 and immediately shot to prominence by winning the cadet class of the NZ CIK Trophy.

2016 followed where he won the Giltrap Group Kartsport NZ Sprint Championship in the Junior Rotax class and demonstrated a seamless transition to circuit racing in the same year by winning the Formula First winter series run at Circuit Chris Amon, Manfeild.

Ngatoa finished runner-up to Callum Crawley in a tight championship fight decided in the final round.

The following year, he would contend the Toyota Finance 86 Championship, with modest results, picking up a race win at the final round at Hampton Downs Motorsport Park.

Following the New Zealand Formula Ford Championship, Ngatoa would contend the Toyota Racing Series for the 2021 season.