David has over 40 years’ experience in architectural, civil, geotechnical, structural, building services design and project management. His expertise was shown not only in Hong Kong, but also in the large-scale civil projects overseas.

His early experience includes motorways and railway bridges in UK. He was the design team leader for Mass Transit Railway immersed tube tunnel, ventilation buildings, cooling water intake structures and reclamation on Kowloon and Hong Kong. He is currently the project director for Hong Kong Boundary Crossing Facilities - Independent Design Checker.

David was the coordinator for studies to provide design parameters for maritime works for Lamma, Shajaio Power Stations and Route 7 (Kennedy Town to Aberdeen) and immersed tube highway tunnel in Kaoshiung in Taiwan. He is responsible for 3 port planning studies, 13 marine impact assessments, preliminary designs for immersed tube in Shanghai and Guangzhou of China, Chi Lin Nunnery and Nan Lian Garden.

He is familiar with the statutory requirements of Buildings Ordinance and Codes of Practices. He is a member of the Building Subcommittee attending regular meetings with Buildings Department and other stakeholders in reviewing building and construction regulations. He founded David S.K. Au & Associates Ltd. (DAAL) and Au Posford Consultants Ltds. (APCL) in 1980 and 1989 respectively to provide architectural, civil, building surveying and other services.