Brittain began his acting career in 2011, making his debut film in the drama film Big Boy, in which he played the lead role of David Grace.
2013
He has had roles in the films A Teacher (2013), Lila & Eve (2015), and Everybody Wants Some!! (2016).
Brittain was born in Shreveport, Louisiana.
He attended University of Texas at Austin in Austin, Texas and completed his graduation.
In 2013, Brittain starred in the drama film A Teacher directed by Hannah Fidell, with Lindsay Burdge, where he played the lead role of Eric Tull.
2015
In 2015, Brittain co-starred Glenn Morshower in the drama film by Claude Green titled The Doo Dah Man.
On the same year, Brittain appeared in the crime drama film Lila & Eve portraying Bradley.
2016
In 2016, Brittain was cast as Billy "Beuter" Autrey in the teen comedy film Everybody Wants Some!! opposite Blake Jenner, Zoey Deutch, Ryan Guzman, Glen Powell and Wyatt Russell, which was premiere at South by Southwest on March 11, 2016 and was theatrically released in the United States on March 30, 2016.
Also the same year, Brittain appeared as Agent Hendricks in the thriller film Transpecos.
2017
In 2017, Brittain appeared as Jake in the thriller drama film The Honor Farm, which was released on March 10, 2017 in the South by Southwest Film Festival.
2018
In 2018, Brittain was cast to play the lead role of Billy in the thriller film Desolate.
On the same year, Brittain appeared on the third season of the sci-fi drama series Colony, he played the recurring role of Dave O'Neill.
Also the same year, Brttain played the role of Jason in the crime-drama film Savage Youth opposite Grace Victoria Cox, Tequan Richmond and Chloë Levine.
2019
In 2019, Brittain co-starred Otmara Marrero, Sydney Sweeney and Sonya Walger in the romantic drama film Clementine as Beau.
On the same year, Brittain portrayed as William at age of 18 in the adventure drama film by Tim Disney titled William alongside Maria Dizzia and Waleed Zuaiter, which was released on April 12, 2019.
Also the same year, Brittain starred alongside Katie Stevens and Lauryn McClain in the slasher film Haunt.
2020
In 2020, Brittain appeared as Donnie Weboy in the neo-Western film Let Him Go.
In 2021, Brittain appeared as Kirk in the dystopian action crime horror film by Everardo Valerio titled The Forever Purge.
In 2022, Brittain co-starred alongside Ben Winchell and Aimee Teegarden in the drama film The Road to Galena, which was released in theaters and on demand on July 8, 2022.
In 2023, Brittain was cast in the drama film Wayward, directed and written by Jacquelyn Frohlich.