She holds a Master of Science in Human Rights from the London School of Economics, a Bar Vocational Course qualification from the Bristol Institute of Legal Practice, and an LLB from the University of Reading.

As Director of Asylum Access Malaysia, Hui Ying oversees all programmes and operations and serves as the organisation's primary policy advocate. She is also Deputy Chair of the Asia Pacific Refugee Rights Network's South East Asia Working Group.

As President of AWL from 2017 to 2019, she brought a rigorous human rights framework to the organisation's advocacy and strengthened AWL's connections with regional and international networks. She previously served as a member of the Malaysian Bar Council Human Rights Committee.