Having joined Citibank in 1982, he went on to become a vice president in 1996. In 2000, he was involved in founding NDB Bank, where he became CEO in 2001. In 2005, he served as a Director and advisor for Board of Investment (BoI) and later became an adviser to the Ministry of Science & Economic Reform. During this time he was instrumental in the formation of the first Information Communication Act and became the founder chairman of the Information Communication Technology Agency (ICTA). He resigned from his post of CEO of NDB to take up his seat in Parliament in 2010.[2]
He joined the right of centre United National Party, serving as its treasurer and entered parliament from the National List at the 2010 General Elections. After the election of Maithripala Sirisena, Wickramaratne was appointed as the Deputy Minister of Investment Promotions and Highways in the "good governance" government under the premiership of Ranil Wickremasinghe.[6] He was appointed as the United National Party chief organiser of the Colombo-East electorate before being shifted to the Moratuwa electorate in 2015. In the general election that followed he was elected to parliament from the Colombo district gaining 82,737 votes.[7] In 2015, he was appointed Deputy Minister of Investment Promotions and Highways and in 2017 he was appointed State Minister of Finance, holding office until the appointment in 2019 of a new caretaker cabinet headed by Mahinda Rajapaksa.
He is the son of prominent evangelical pastor, Rev. Dr. Colton Wickramaratne (1931-2018), and the brother of Rev. Dishan Wickramaratne. He is married to Kushlani Wickramaratne and father to two children, Sohanya and Dhishan.[8]
