Born in Dayton, Ohio; Saintgnue was placed into foster care at the age of nine and later was adopted. Cody began acting and participating in theater productions as a way of expressing himself and positively coping.
After diving into print modeling in the Ohio area, Cody traveled to Texas for a Model and Talent Expo and surprised everyone by winning the competition as a newcomer and landing himself the front page cover of the competition showcase magazine.
He relocated to Los Angeles to train intensely in production acting. Before Teen Wolf, he made television appearances on Southland, Criminal Minds, and House M.D. He also appeared in short films like The Storybook Killer and Two Girls at Brunch.
Saintgnue took part on the television series documentary, America's Most Wanted: America Fights Back. With a few television roles adding to his experience, he was cast in his first film, All Cheerleaders Die in 2013 before being cast in the film, Preservation.
He worked on The Mafia Ain't Dead and The Thunderers where he both acted in and produced with others.