He benefited from the significant political changes in Brunei, particularly those initiated by Sultan Omar Ali Saifuddien III, who championed the country's transition to internal self-government in 1959 and independence in 1984.

The Sultan's commitment to educating Bruneians played a crucial role in shaping Yong's opportunities to contribute to the nation’s governance.

[2] In order to prepare for taking over the position when the main Chinese schools supervisor retired, Yong was moved to Anthony Abell College in Seria in 1958 to teach English preparatory classes and serve as an understudy.

Under the Colombo Plan, Yong was awarded a scholarship by the Australian Government in 1960 to study teaching english as a foreign language at the University of Sydney.

Additionally, he served as the chair of the board for the National Junior and Senior Middle Common Examinations, which Taiwanese and Singaporean colleges accepted.

During his tenure, he managed significant ASEAN meetings and discussions with key partners, including the United States, the European Union, and Japan.

[10] Notably, he presided over the seventh ASEAN Economic Ministers' meeting on energy cooperation held from 7 to 8 April 1988, where Sultan Hassanal Bolkiah officially opened the proceedings.

After several years of hard work, he established his own business as a rubber and vegetable farmer in Kampong Subok, located about 3 miles (4.8 km) from Brunei Town.