Fautanu played 4 seasons as an offensive and defensive lineman at Liberty High School in Nevada. He was ranked the No. 27 offensive guard prospect and No. 2 overall prospect in Nevada by 247Sports. He also lettered in volleyball in high school and committed to Washington during his senior year.
He took a redshirt in 2019 and saw action in 4 games during the 2020 season. He played in nine games, starting three; two at left tackle and one at left guard in the 2021 season.
2022 saw Troy Fautanu become a full time starter, starting 12 games at left tackle and 1 game at left guard and so far this season he has started at left tackle in every game.
In 2023, Fautanu started each game at left tackle for the Huskies.