Dilhan joined Temasek in September 2010. He was appointed Executive Director and Chief Executive Officer of Temasek Holdings on 1 October 2021. In his current role, he has oversight of all entities under Temasek Holdings, including Temasek Singapore, Temasek Global Investments, Temasek Partnership Solutions, and Temasek International.

Dilhan has held various leadership roles in Temasek, including Head of the Investment, the Portfolio Management and the Enterprise Development Groups. He has also led the Temasek market teams in Singapore and the Americas.

Prior to Temasek, Dilhan was the Managing Partner of WongPartnership LLP. He has over 20 years of legal experience, mainly focusing on mergers and acquisitions, corporate governance, and corporate law.