Ryan Gatoloai-Faupula is rated as a three-star recruit by Rivals, Scout.com and 247 Sports. He was selected to the Sacramento Bee First Team All-Metro team as a linebacker his senior season. 247 Sports ranked Gatoloai-Faupula as the 122nd overall recruit in the entire state of California. Gatoloai-Faupula led Inderkum High to the 2016 Championship Game of the Sac-Joaquin Sectional Playoffs for Division II. Inderkum entered the sectional playoffs seeded No. 8 after capturing the Tri-County Conference title with a perfect 6-0 league mark and an 8-2 regular-season record. The Tigers proceeded to defeat No. 9 seed Whitney, 42-7, in the first round of the playoffs. In the quarterfinals, they captured a 35-33 upset win over No. 1 seed Sacramento. Inderkum earned a spot in the sectional championship game by defeating No. 4 seed Jesuit, 52-35, in the semifinals before falling in the championship game to No. 2 seed Del Oro, 13-35. The Tigers ended the season with an 11-3 overall record. Gatoloai-Faupula played for head coach Terry Stark.
Gatoloai-Faupula was also recruited by Boise State, California, Colorado, Fresno State, Nebraska, Nevada, New Mexico, San Jose State, Utah and Utah State.