He was appointed Assistant Land Revenue Collector on 1 August 1946,[5] and on 1 February 1947, he was promoted to Administrative Officer Grade II.

[4] Pengiran Abu Bakar often joined Sultan Omar Ali Saifuddien III on his travels to isolated villages, including Friday prayers at the Kampong Pudak Mosque.

After the constitution was put into effect, the Sultan formed an 11-member Citizenship Status Law Committee to examine the legislation that Tuan Sufian bin Haji Hashim had written with help from Michael and Sir Neil Lawson.

One of the committee members, Pengiran Abu Bakar, made a substantial contribution to the debates by offering insightful information on the preparation, negotiating, and execution of the constitution.

Following an invitation from Duncan Sandys, the British Secretary of State at the time, under Prime Minister Harold MacMillan, he was a member of the delegation that accompanied Sultan Omar Ali Saifuddien III on 22 July 1963, to lead Brunei's representation in negotiations with the British government regarding Brunei's potential entry into the Federation of Malaysia.

As a mark of final respect, all flags across the nation were flown at half-mast in accordance with Brunei's royal customs pertaining to the passing of a Cheteria.