He later moved on to work as an associate editor in films like Thevar Magan (1992) and Kuruthipunal (1996) with N P. Satish.

He later worked under A. Sreekar Prasad in films of several languages including Oriya, Sinhalese and Kannada.

[citation needed] He made his debut as an editor with Kamal Haasan's Aalavandhan (2001), experimenting with techniques involving animation and motion capture cameras, and then worked in the romantic comedy, Pammal K. Sambandam (2002).

Kasivishwanthan subsequently went on to collaborate as an editor in several of Prakash Raj's productions with Duet Movies.

He has since regularly collaborated with directors including Radha Mohan, Suseenthiran, Seenu Ramasamy Sundar C Myskin and Siruthai Shiva's Veeram.