Lim joined the civil service on 23 July 1969, starting his career as a curator in the Museums Department.[9] He worked at the Department of Ethnography, British Museum from 1972 to 1973, in addition to being an Assistant Curator for the Museums Department from 1969 to 1973. He became the Deputy Director at the Museums Department from 1974 to 31 December 1982, promoted to Director at the Museums Department from 1 January 1983 to 5 August 1983.[8]
Lim has published several works which included:[8]
Lim entered the Diplomatic Service Department in 1982,[7] and joined the Ministry of Foreign Affairs (MFA). He first held roles such as Director-General of ASEAN–Brunei Darussalam in August 1983.[7][10] In February 1986, he was then named High Commissioner of Brunei Darussalam to New Zealand. He started working for the MFA in May 1986 as the Director of Politics and was later elevated to the position of Permanent Secretary.[3][2][10]
On 1 May 2010, the Western Washington University Department of Anthropology hosted a group from Brunei. Pehin Lim and Yusoff Abdul Hamid traveled with the intention of seeing Linda Kimball. Kimball was a renowned expert on the language and customs of the Bruneian Malay people.[14] On the final day of the APEC Ministerial Meeting in Yokohama, Japan, 10–11 November 2010, Peter Van Loan talks with Pehin Lim.[15]
Pehin Lim emphasised the significance of bilateral and international free trade agreements for Brunei at the Legislative Council meeting on 7 March 2011. He stressed that these accords help consumers, expand the nation's market reach, boost the competitiveness of domestic goods, and draw in foreign capital. Because to Brunei's participation in various accords, such as those with the TPP, Japan, ASEAN, and other nations, commerce has been facilitated, export competitiveness has grown, and economic diversification has been encouraged.[16]
In January 2016, Lim met with Japanese Foreign Minister Fumio Kishida. At that time, Seng's official role was "Minister at Prime Minister's Office and Second Minister of Foreign Affairs and Trade of Brunei Darussalam."[17]
Pehin Lim was bestowed the Manteri title of Yang DimuliakanPehin Orang Kaya Pekerma Dewa in May 1996,[8] in recognition of his contributions, together with other commendable honours.[10] Throughout his career, he has earned the following honours and fellowships:[21][8]
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