Hilliard-Arce made his Stanford debut on August 29, 2014, where he started and played all 90 minutes in a 0–2 loss at Creighton.
On September 9, 2014, he scored his first college soccer goal for the Cardinal, in a 4–1 win over UC Santa Barbara.
Hilliard-Arce was named one of three finalists for the Hermann Trophy, but ultimately lost on voting to Jon Bakero of Wake Forest.
[3] Following his release from LA Galaxy at the end of their 2019 season, Hilliard-Arce joined USL side Sacramento Republic on January 8, 2020.
[4] On October 27, 2020, following the USL Championship season, Hilliard-Arce announced his retirement from playing professional soccer.