Piumi is an Attorney-at-Law, with a Bachelor of Laws (Hons) degree from the Faculty of Law, University of Colombo and a Master of Arts degree in Poltical Science from the University of Kelaniya. She is a past pupil of Visakha Vidyalaya, Colombo 05.
She has previously engaged in legal practice in civil law and has worked as a National Consultant on RTI at the United Nations Development Programme.
Piumi joined TISL in 2021 as the Legal Officer for the Community and Branches sector. She provides legal advice for the victims and witnesses of bribery and corruption, and for any persons seek legal advice from TISL, facilitates RTIs and she is involved in projects promoting freedom of information in Sri Lanka.