Dev catapulted to success in 2009 when he starred in the Academy Award® winning film Slumdog Millionaire and received rave reviews for his performance and garnered a number of award wins including the National Board of Review Award for Best Breakthrough Performance, The British Independent Film Award for Most Promising Newcomer, The Broadcast Film Critics' Choice Award for Best Young Actor and The Chicago & Washington Film Critics' Awards for Most Promising Performer.
Dev voiced the male lead opposite Daisy Ridley in Studio Ghibli's North American re-release of Only Yesterday, directed by Isao Takahata. He also starred in The Man Who Knew Infinity and, with Hugh Jackman, Sharlto Copley and Sigourney Weaver, in Neill Blomkamp's Chappie. He starred opposite Dame Judi Dench, Dame Maggie Smith, Bill Nighy and Richard Gere in The Second Best Exotic Marigold Hotel directed by John Madden and in the original The Best Exotic Marigold Hotel opposite the same cast including Tom Wilkinson. The film became a worldwide commercial success and was nominated for a Golden Globe and SAG Award for Best Picture. Dev was last seen on TV starring opposite Jeff Daniels and Emily Mortimer in the 3rd and final season of HBO'S Golden Globe nominated series The Newsroom, created by Aaron Sorkin, for which he was nominated for a 2013 NAACP award for Best Supporting actor.