Vositha is an attorney-at-law specialising in public international law, with a focus on international environmental law, UN human rights law, refugee law and EU law. She has over a decade of experience in working on climate change, at national and international level. Vositha is a member of the national expert committee on climate change adaptation of the Ministry of Mahaweli Development and Environment, national expert on vulnerability and adaptation measures for the Third National Communication of Sri Lanka to the UNFCCC for the Ministry of Mahaweli Development and Environment, and is a delegate focusing on compliance, adaptation, loss and damage, and gender for the Sri Lankan delegation to the UNFCCC since 2016. She is also a consultant to the UNFCCC national adaptation plans and policy unit, and worked as a country support consultant to the UNDP NAP Global Support Programme. Vositha has an LLM in public international law from University College London, and an LLB from University of London.