After completing his Sound engineering in Chennai, he went on to job with A.R.Rahman. After a short stint with him, he resting on and settled in Pune, wherever he started scoring for ad jingles, web sonics, and short films. Pillai considers A.R.Rahman to be his professional direct and mentor.In early 2004, Pillai got his first smash to compose a radio jingle and then went on to create jingles, for both radio and television consumption.In the year 2007, Prashant scored music for Bejoy Nambiar's, seriously acclaimed short film Rahu where he teamed with singer K. S. Krishnan.