Jamie embarked on a career in politics after serving as a Marlborough district councillor since 2010 where he chaired the economic, finance, and community committee. He is currently a member of the Business, Finance and Expenditure, and Officers of Parliament Select Committees as well as the Deputy Chairperson for the Justice Select committee and Whip for New Zealand First.

Jamie remains committed to his constituents in Marlborough, continuing to serve as a councillor until October 2024 to avoid a by-election.