He started his career as a theatre actor. He played noted roles in plays like Piya Behrupiya, Stories in a Song, Monsoon Wedding: The Musical, Detective 9-2-11, Aaj Rang Hai and Baaghi Albele.[2][7][8][9]
He made his Bollywood debut in the year 2014 with Akarsh Khurana’s directed tv film Sunsilk Real FM and played the role of Jwahar.[10] Then he appeared in Sudev Nair’s directed tv series Not Fit as Raunak.
In the year 2023, he came to limelight with playing as the protagonist Abdul Karim Telgi in Tushar Hiranandani’s directed tv series Scam 2003: The Telgi Story.[14]
His performance in Scam 2003 praised by audience and critics wrote very positive quotes about him in film's reviews.
Shubra Gupta of Indian Express said: "Gagan Dev Riar as Abdul Karim Telgi is terrific".[15] Yatamanyu Narain of News 18 stated: "Gagan Dev Riar as Abdul Telgi is the heart and soul of Hansal Mehta's show".[16] Bhavna Agarwal of India Today stated: "Gagan Dev Riar nails it as Telgi".[17]
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