[3] Before entering in the industry, Siddiqui had worked in a number of television commercials for brands including ICICI Bank, Bombay Dyeing, Cadbury Perk, Suzuki Alto and Gillette.

[5] Actor Victor Banerjee was impressed by his acting skills and offered him to play lead role in the film Ho Sakta Hai (2006), directed by Wilson Louis.

[7] In 2007 he participated in the song "Mujhe Khabar Thi" from Lata Mangeshkar's music album Saadgi(2007) opposite Mona Singh, launched by T-Series.

[9] In the same year, he played the roles of Tauseef Baig in the drama Tum Saath Ho Jab Apne (2014) where his character, being dead is seen in flashbacks,[4] a superhero and his alter-ego journalist in Maharakshak: Aryan (2014)[4] and as a mythological king in The Adventures of Hatim (2013).

Khalid also appeared in Star Plus's most popular drama series Saath Nibhaana Saathiya[12] as a protagonist, opposite Devoleena Bhattacharjee after the walk-out of the lead actor Mohammad Nazim, who was playing Ahem.