Bostick was born in Toronto, Ontario. Devon began acting in grade five. He is a graduate of the Etobicoke School of the Arts in Toronto. He has had roles in the TV series Degrassi: The Next Generation and in the film Citizen Duane. His film work has included roles in Godsend, Fugitive Pieces and The Stone Angel. In Adoration he plays Simon, a boy who is being raised by his uncle (played by Scott Speedman) after his parents' death. He also appears in an online spoof trailer for a hoax movie called "Ice Fortress". It is believed by people close to Sam Earle that him and Devon do not like each other.
He plays Silver in Netflix original "Okja". Devon also portrayed Jasper Jordan in CW's "The 100."