Julie Reiner holds DESS and DESCF postgraduate degrees in corporate finance and financial engineering and accounting from Université Paris Dauphine.  She began her career in merchant banking at HSBC in 2000 and moved to Société Générale in 2008.

In 2009, she joined SNCF Group's Mergers and Acquisitions unit and was named to lead it in 2015.

She became head of Corporate Development in 2018.

Ms Reiner was appointed Chief Financial, Legal and Regulatory Officer for SNCF Gares & Connexions in May 2019.

She was appointed Chief Administrative Officer on September 1, 2023 and is thus in charge of finances, purchases, legal affairs and regulation. She is also responsible for the strategy, the operational excellence and innovation, and for the CSR roadmap for Gares & Connexions.