After graduating from Oxford University, he joined NatWest Securities, which later merged into Deutsche Bank; in 2001, Quin became a Managing Director of the firm. In 2008 and 2009, he served as Senior Corporate Financial Adviser during the financial crisis.[12]
Quin was again re-elected at the 2019 general election, with a decreased vote share of 56.8% and a decreased majority of 21,127.[19]
Following the election, Jeremy became Parliamentary Secretary in the Cabinet Office with responsibilities for the Government Commercial Function and other cross-government programmes.[20]
In February 2020, Quin was appointed as Minister of State in the Ministry of Defence.
In September 2022, Quin was appointed Minister of State in the Home Office.[21]
In October 2022, Quin was appointed Paymaster General and Minister for the Cabinet Office.
On 27 October 2022, Quin was appointed to the Privy Council.
In November 2023, Quin resigned from government to focus on projects in his constituency.[22]
Quin was elected Chair of the Defence Select Committee on 17 January 2024.[23] The Committee published its report, 'Ready for War?' on 4 February 2024.[24]