His feature film credits include co-starring roles in Hotel for Dogs, New Year's Eve, Rio and The Emoji Movie.

[1] His mother is of Puerto Rican, Argentine, and Spanish descent, and his father is of Polish, Irish, and English ancestry.

A year later, he appeared in his first credited acting role as Kid 1698 in a comedy sketch on Late Show with David Letterman.

[9] In 2006, Austin landed the lead role of Angel Macias in his first live-action feature film, The Perfect Game, which was based on a true story about the first non-U.S. team to win the 1957 Little League World Series.

[7][19] In 2011, Austin voiced the role of Fernando, an orphaned Brazilian boy who is forced to capture exotic birds, in the 20th Century Fox animated musical film Rio.

[21] The following year, he had guest roles on the Lifetime comedy-drama Drop Dead Diva as Samuel Forman, a 16-year-old multimillionaire,[22] and on the NBC legal drama series Law & Order: Special Victims Unit as Rob Fisher, the boyfriend of a girl whose family is murdered.

[24] The series tells the story of two moms raising both biological and foster children in a "multi-ethnic" household in San Diego, California.

[26] In 2016, he provided the voice for Jaime Reyes / Blue Beetle in the DC Comics animated direct-to-video film Justice League vs.

[29] In October 2018, it was announced that Austin joined the cast of Adverse, a neo-noir thriller starring Mickey Rourke.

[4][8][31] His family owns a restaurant called The Clarksville Inn in West Nyack, New York, which was originally built in 1840 and served as a hotel.