Tiong worked at
McKinsey & Company from 2014 to 2016 as a business analyst, and at
Millennium Management from 2016 to 2018 as a quantitative analyst. He later became head quant developer and portfolio manager at Brahman Capital and worked there until 2022. In April 2025, he was spotted at an Aljunied GRC event, causing speculation that he would run in the
2025 general election. On Nomination Day, 23 April, Tiong was officially announced as a WP candidate for Aljunied GRC. During the
2025 general election, Tiong was in a five-member WP team and contested in
Aljunied GRC with
Pritam Singh,
Sylvia Lim,
Gerald Giam and
Fadli Fawzi and won the GRC with 59.71% of the votes. Tiong was elected as Member of Parliament representing Aljunied GRC in the
15th Parliament.
Central Executive Committee In June 2025, Tiong was co-opted to the WP's Central Executive Committee (CEC) as the party's deputy treasurer.
Parliamentary record On 12 February 2026, Tiong moved an
adjournment motion proposing that Singapore develop as a regional gold trading hub, outlining proposals for sovereign custody guarantees, expanded refining capacity, a bullion standard, and gold derivatives infrastructure. In his parliamentary reply, MAS Deputy Chairman
Chee Hong Tat said the government's objectives "do not differ" and that it would consider the proposals. On 27 March 2026, MAS and the Singapore Bullion Market Association announced plans to develop Singapore as a gold trading centre, including vaulting services for foreign central banks. == Personal life ==