In 1995, following the election of Jacques Chirac, Augustin de Romanet became technical assistant to finance minister Alain Madelin for a short period, before transferring to François d'Aubert’s secretary of state’s office where he became chief of staff.

Then, as financial advisor, he joined the cabinet of Alain Lamassoure in the ministry of budget, followed by a project manager position for finance minister Jean Arthuis.

[3] On 7 March 2007 Augustin de Romanet became the chairman of the Caisse des dépôts et consignations, the French state bank that manages €400 billion worth of assets.

Through this position, Augustin de Romanet became a board member of many state-controlled companies (Accor, Dexia, Icade, Veolia Environnement, Oséo, La Poste, ...).

[1][2] He served as the chairman of the Fonds stratégique d'investissement, the newly created state-owned investment fund, from November 2008 to March 2012.

[2] On 28 November 2012, Augustin de Romanet became chief executive officer of the French airports operator Groupe ADP, replacing Pierre Graff who retired.