As a principal assistant secretary in the financial services and the treasury bureau in the Government of the Hong Kong Special Administrative Region, Pecvin oversees policy on local taxation and related legislation, and provides policy direction on revenue matters. She is involved in the preparation of the annual budget for the government, and she oversaw the introduction of a two-tiered profits tax rates in Hong Kong starting in April 2018. In her 17 years of public service, Pecvin formulated unprecedented policies for repositioning and rebranding vocational education and strengthening the self-financing post-secondary education sector in Hong Kong, established education policy for ethnic minority students, reviewed the policy on medium of instruction in secondary schools, and prepared legislation introducing fixed penalties for public cleanliness offenses.