Indrajit was the 14^th Governor of the Central Bank of Sri Lanka (CBSL), from 2016 to 2019. As a career economist at CBSL since 1973, Indrajit has been a staff officer in Economic Research, Statistics, and the Bank Supervision divisions. From 1981 to 1989, he was seconded to the Ministry of Finance and Planning as an advisor on Macroeconomic Policy and Structural Reform. In 1990, Indrajit joined the Commonwealth Secretariat, where he went on to serve as the Interim Director of Social Transformation programs at the organization.

Indrajit was a member of the CBSL Monetary Policy Consultative Committee from 2013 to 2015, and was an advisor to the Ministry of Development Strategy and International Trade from 2015 to 2016. Additionally, he was also on the Board of Directors of John Keels Holdings PLC and Tokyo Cement Company (LK) PLC.

Indrajit has a B.A. and M.A. from the University of Cambridge, and a Ph.D. in Economics from the University of Sussex.