Joyce is a lawyer licensed to practice in the Philippines and in the State of New York, USA. She obtained her Juris Doctor degree with honors from Ateneo de Manila School of Law, Philippines, where she later taught International Environmental and Climate Change Law and Philippine Natural Resources and Environmental Law. She has a Master of Science in Environment and Development, with distinction, from the University of Edinburgh, UK where she was a Chevening scholar. Her dissertation explored failures in organizational communication that led to large-scale disasters in the Philippines' eastern seaboard, despite accurate predictions by the national weather bureau. Prior to joining Dejusticia, she worked with the Asian Development Bank as a consultant on Environmental Law education in 14 countries across South and Southeast Asia. She has also worked as a climate change and disaster management policy specialist at the Ateneo School of Government, where she advised government ministries and legislators on climate change and disaster laws and policies. She was also a member of the Philippine delegation to the United Nations Framework Convention on Climate Change (UNFCCC) 21st and 22nd Conference of the Parties (COP21 and COP22), when the historic Paris Agreement was adopted and its early implementation mechanisms discussed. In the delegation, she worked on areas around climate finance and capacity building. Prior to this, she was an associate at SyCip Salazar Hernandez and Gatmaitan, where she specialized in energy, water, infrastructure, environmental regulation, and dispute resolution.