Before television, Davis worked as a scaffolder, bouncer, market stall trader and a stand-up comedian. When his friend was working as a runner on Bo' Selecta, they gave some videos of their own comedy sketches to Leigh Francis, who then invited Davis to appear on the show. He appeared in various comedy roles on TV over the following years. In 2015 he co-created and starred in Murder in Successville. This semi-improvised show, in which a celebrity guest must help DI Sleet solve a fictional crime, became a cult hit. In 2016, Davis was named a BAFTA Breakthrough Brit and appeared in the films Free Fire and Prevenge.