Lydie Jallier began her career in 1998 at Delphi, in charge of continuous improvement and internal communication, then Human Resources for three product lines. 

In 2008, she joined Technip as Head of Talent for Subsea Activities and Onshore-Offshore Project Management for Europe, the Middle East and Africa. In 2010, she was appointed Director of Human Resources at the headquarters, and in 2013, Director of Human Resources for onshore-offshore activities in Southern Europe, the Middle East, Latin America and Russia. 

In 2016, she joined Zodiac Aerospace as Director of Training and Talent. In 2017, she was appointed Group Human Resources Director. After the acquisition of Zodiac Aerospace by Safran, she became a member of the integration team in charge of managing human resources. 

In October 2018, she joined Safran Landing Systems as Senior Vice President, Human Resources until June 2022, when Lydie was appointed Senior Vice President, Recruitment and Talent Development at Safran.