Ms Hui took up the position of Executive Director of the Long Term Business Division of the Insurance Authority when it took over from the Office of the Commissioner of Insurance (OCI) on 26 June 2017. She started her career in the OCI in 1990, and held various management positions there in the prudential supervision of insurers and insurance intermediaries, policy development and strategy formulation. As lead regulator of the insurance groups based in Hong Kong, she exercised group-wide supervision and organised supervisory college meetings in Hong Kong. She launched the Qualifying Deferred Annuity Policies to the public within one year to provide tax incentives to policy holders taking out deferred annuities products, as a means of encouraging early retirement planning. On the FinTech front, she was instrumental in introducing the Fast Track, which led to the authorization of the first virtual insurer in Hong Kong, and facilitated the e-onboarding process.