By the end of the 2019 season, Mateos’ offensive line was ranked No. 12 overall by Pro Football Focus.

From 2017 to 2018, Mateos was Texas State’s offensive line coach for two seasons, during which he produced an All-Sun Belt player each year. Mateos was the tight ends coach at LSU in 2016 before joining the Bobcats. He began the season as a graduate assistant on the offensive line for Baylor under offensive coordinator Jeff Grimes.

Mateos was appointed tight ends coach by Ed Orgeron halfway through the 2016 campaign, and he assisted in leading the Tigers to a Citrus Bowl victory over Louisville. Mateos served under Sam Pittman at Arkansas from 2013 to 2015 before joining Grimes at LSU.

Before spending a year in 2012 as the offensive line coach and recruiting coordinator at Hutchinson Community College, he started his coaching career in 2011 as an assistant offensive line coach at Southwest Baptist.

Mateos started for two years at Southwest Baptist, where he was the team captain in 2009 and 2010. In 2011, he graduated from Southwest Baptist with a bachelor’s degree in public relations, and in 2015, he obtained a master’s degree from Arkansas. Mateos is wed to the ex-Gillian Chavez, and together they have a daughter named Izzy.