[1] Kumar decided to pursue acting professionally when he performed Shakespeare for the first time at age 15[2] and subsequently joined the National Youth Theatre.
[4][5] Upon leaving drama school, Kumar joined the recurring cast of the Showtime thriller series Homeland for its fourth season as Rahim, a Pakistani medical student, which aired in 2014.
[6] He then appeared in the second season of the TNT crime drama Legends as Ifti Bulfati, as well as the films Legacy and One Crazy Thing.
[7] In 2017, Kumar had a main television credit as barman Adil Joshi in the ITV World War II drama The Halcyon.
Kumar played FBI agent Ansh Ramachandra in the 2019 crime thriller film Inside Man: Most Wanted with Aml Ameen, Rhea Seehorn, and Roxanne McKee.