[1] Stewart-Jarrett made his professional stage debut with a number of roles in Brixton Stories at the Lyric, Hammersmith, and was in the fourth cast of The History Boys at the National Theatre.

[citation needed] The year after leaving Misfits, Jarrett began starring as Ian Johnson in the Channel 4 conspiracy thriller series Utopia and made his feature film debut in the crime comedy Dom Hemingway.

[citation needed] Stewart-Jarrett played the drag queen Belize, Prior Walter's (Andrew Garfield) friend, in the 2017 National Theatre production of Tony Kushner's Angels in America directed by Marianne Elliott, for which Stewart-Jarrett was nominated for the WhatsOnStage Award for Best Supporting Actor in a Play.

[citation needed] In 2019, Stewart-Jarrett portrayed actor Steve Driver in the biographical film Mope[4] and Johnny Edgecombe in the BBC One miniseries The Trial of Christine Keeler.

[citation needed] In 2021, Stewart-Jarrett made a guest appearance in the Doctor Who special "Revolution of the Daleks", starred as Troy Cartwright in the Candyman sequel, and had a main role as guidance counsellor Sam in the HBO Max teen comedy-drama Generation (stylised as Genera+ion).