He has appeared in the TV shows Grey's Anatomy, Major Crimes, Ghost Ghirls, The Goldbergs, Growing Up Fisher, Mixology, Fuller House and Deputy.

[4] In 2011, Buchanan was cast in the comedy television film Untitled Jeff and Jackie Filgo Project alongside Tricia O'Kelley, Mimi Kennedy, Becki Newton, Shane McRae and Ivan Hernandez, in which he played the lead role of Jimmy.

[8][9] In 2015, he had a recurring role in Disney Channel's Girl Meets World portraying Charlie Gardner and also played Mason Kendall in Nickelodeon's Game Shakers.

[17][18] On the same year, he starred as Dylan in Damián Romay's thriller television film Sinister Seduction opposite Kristina Klebe, Sebastian Cabanas and Carson Rowland.

[26][27] In 2024, Buchanan starred alongside Sebastian Croft and Charithra Chandran in the British teen romantic comedy film How to Date Billy Walsh directed by Alex Sanjiv Pillai, which was released on Amazon Prime Video on April 5, 2024.