In his true freshman season, Vaki totalled 41 tackles with 3.5 going for a loss, three pass deflections, and a forced fumble in the 2022 season. In week one of the 2023 season, he recorded his first career interception versus the
Florida Gators. In week seven, Vaki had a breakout game where he played both ways of the ball as he rushed 15 times for 158 yards and two touchdown to help the Utes beat
California. In the following week, he rushed nine times for 68 yards, while also hauling in five receptions for 149 yards and two touchdowns, while also notching two tackles and having the best coverage grade on the Utes, as helped them upset
USC 34–32. The rest of the season, the Utes formulated a plan to use Vaki more on offense. As a sophomore, Vaki finished the season with 51 tackles, 8.5 tackles for a loss, two sacks and two interceptions on defense. On offense he had 317 yards rushing (7.5 yards per carry) and two rushing touchdowns. As well as 11 receptions for 203 yards and three receiving touchdowns. He was voted to the first-team
All-Pac-12 team twice in 2023, both as a safety and a special teams/all-purpose player. Following the 2023 season, Vaki declared for the
2024 NFL draft after playing two seasons of college football, as he went on a three-year mission trip following his high school graduation. == Professional career ==