After graduating, Girish started making short films. Yashpal, Vishuddha Ambrose[6] and Mookutthi were his early works, all of which got critical acclaim and viewership. He bagged the best Director Award in Adoor short film festival 2017 for Vishuddha Ambrose.[6]
After briefly appearing in Bilahari K Raj's 2017 independent film 'Porattam[7]', Girish debuted as a writer in Malayalam film industry in 2018 with Allu Ramendran directed by Bilahari K Raj. The following year, he made his directorial debut with Thanneer Mathan Dinangal (transl. Watermelon Days). The film being a coming-of age romantic comedy co-written by Dinoy Poulose, was jointly produced by Plan J Studios and Shebin Backer Productions. It starred Vineeth Sreenivasan, Mathew Thomas, and Anaswara Rajan in the lead roles. In 2022, Girish's second directorial Super Sharanya got released and met with mixed reviews from critics but was a commercial success.[8] Then he directed two films, Premalu and I Am Kathalan and both got released in 2024. Premalu received highly positive response and became one of the highest grossing Malayalam film of 2024.[9]I Am Kathalan met with mixed reviews from critics.[10]