[7] She continued her studies at École nationale des ponts et chaussées, earning her bachelor's degree in Civil Engineering & Public Management in 1997.

[8][2] Estelle Brachlianoff started her career in 1998 as the head of the Val-d'Oise department, where she worked on infrastructure projects, within the Val-d’Oise region of Greater Paris.

In 2002, she was appointed as a special advisor for the Greater Paris Île-de-France Prefecture, and was in charge of public transportation and urban planning.

In 2012, Brachlianoff moved to the United Kingdom to lead as the CEO of Veolia Environmental Services, UK region.

[4][10] During that time, Brachlianoff was only the third female at the helm of a Paris CAC 40 company, following Engie's Catherine MacGregor, and Christel Heydemann of Orange S.A..[11] She is an ardent proponent of the concepts, "circular economy"[12] and "ecological transformation".