Chiranthi has a Bachelor of Laws (LLB) degree from the University of London (International Programmes) and a degree in Dentistry from the University of Peradeniya.
Before joining LIRNEasia, she worked on a research project at the Lakshman Kadirgamar Institute for International Relations and Strategic Studies, and as the Regional Communications Officer at the Global Water Partnership South Asia. She has also worked as a feature writer in the print media and as a project manager in the non-governmental sector.