Born and raised in Hong Kong, Senia holds degrees in law from the University of Hong Kong and the London School of Economics and Political Science, where she graduated with Distinction. She called to the Hong Kong Bar in 2014 and built a legal career specialising in human rights and constitutional law. She also lectured at the Faculty of Law of the University of Hong Kong, and was awarded the Faculty Outstanding Teaching Award in 2019 in recognition of her outstanding teaching performance.
Senia believes in using her legal knowledge creatively to build a better society. Throughout the years, she utilised different platforms to promote rule of law, democracy and human rights in Hong Kong, including through being a Director of Project Citizens Foundation and a Member of the Progressive Lawyers Group. In recognition of her contribution to society, Senia was selected as Obama Leader Asia-Pacific in 2019.