Wan Kamaruddin has always been in the Finance field since he first graduated from University of Malaya in 1980. He started his career with Bank of America, Amanah Merchant Bank, JP Finance (on loan to Bank Negara & subsequent assignment by them), Amanah Merchant Unit Trust Bhd and Amanah International Finance Bhd as Chief Executive Officer.

In 1995, he moved to Fieldstone Capital Services Sdn Bhd, a Boutique Financial Advisory Firm where he was involved mainly in Project Finance Advisory services involving mostly highways and power plants.

The Asian financial crisis of 1999 saw the entry of Babcock & Brown Asia Pacific (BnB) opening its office in Kuala Lumpur and the whole team at Fieldstone was absorb into BnB. Again, whilst with BnB he led a team advising Penerbangan Malaysia Bhd / Malaysia Airlines in their lease finance of various aircrafts (777s, 747s freighters and ATRs) in 2002, 2004, 2006 and 2009. He was also involved in advising clients in bidding for various power plant projects.

In 2009, upon leaving BnB, he acted as advisor to Markmore Energy in their acquisition of an oil field in Kazakhstan. The acquisition and arrangement of finance was completed in 2012. Wan is currently involved in a cafe operations having secured a franchise agreement fromPetroleum Authority of Thailand (PTT) in 2019 to operate Cafe Amazon in Malaysia. He is also an Advisor to a Solar Panel cleaning services company.