Sui started her career in 1993 as an Investment Banker at Merrill Lynch. From 1999 to 2003, she was a Head of Strategic Development at Asia Global Crossing. Later , she also worked as an Investment Banker at JPMorgan and BNP Paribas. From 2013 to 2015, Sui had a position of Vice Chairman of Avista Advisory Group. 
Currently, Sui is an Operating Partner at Wavemaker Partners. In addition, she is also a Board member of Parkway Trust Management, CDL Hospitality Trusts and Leap201, Bridge South East Asia.