[3][4] Hillier was also twice winner of the Bledisloe Cup, in 2016 and 2018, as the leading amateur in the New Zealand Open, and was a co-medalist, with Cole Hammer, at the 2018 U.S.

[5][6] As a 17-year-old amateur, Hillier won the 2015 John Jones Steel Harewood Open on the Charles Tour.

The team led by three strokes after three rounds but faded on the final day and finished in fourth place behind Denmark, the United States and Spain.

[11][12] He had some success on that tour, winning two of the six events, the Brian Green Property Group NZ Super 6 Manawatu in March and the DVS Pegasus Open in October, and ending the year as the winner of the Order of Merit.

[18] In July 2023, Hillier claimed his first European Tour win at the Betfred British Masters in England.