Having worked in large corporates from early 2000s like HDFC Standard Life, Max New York Life & Reliance Mutual Fund, in 2012, he joined a startup and set up the core business team across geographies. He setup the distribution network and expanded it from 1 city to 441 cities across the globe with about 1000 distributors in a span of 4 years. The firm got ranked as one of the fastest growing fin-tech start-up by Financial Times in 2016. The total market value of projects funded being 1.3 billion US dollars i.e. roughly Rs.10,000 crores. It is notable that in the first 15 years of his career when he was employed Kaustuban got promoted 13 times proving to be a valuable and trustworthy employee raising from a Junior trainee to be the Global Head of Business. From 2018, Kaustuban has been building a few of his own ventures which is well diversified across industries like Interior Designing, Real Estate Investing / Broking, Home Improvement & Wealth Management.