He is best known for his recurring role in the Netflix series Shadow and Bone (2021), as well as for portraying Vladimir Makarov in Call of Duty: Modern Warfare III (2023).

[2] He attended the Spanish-language Frederic Joliot-Curie School in Varna,[3] before entering post-secondary studies at Tilburg University, where he majored in international business.

[4] After two years in the Netherlands, Kostov decided to move to the United Kingdom and pursue a career in acting, inspired by Heath Ledger's performance in The Dark Knight.

[5] Kostov began his acting career in Bulgarian and British productions, including a two-episode guest arc on 24: Live Another Day in 2014.

[8] Kostov has had a number of television roles, including Timur in A Discovery of Witches,[9] Sergei Basarov in Berlin Station, and Yuri Leniov in Treadstone.

[15][16] He is also slated to co-produce and lead Kristina Grozeva and Petar Valchanov's Triumph,[10] and star alongside Josh Hartnett in James Madigan's upcoming film Fight Or Flight.