[2][3] Wahl began his career in government in 1984 at the Council of State as an auditor and Master of Requests; in 1986, he also became an advisor to the president of the Commission des opérations de bourse, the French stock market regulator.

In 1997, he became director of the specialist financial services arm and a member of the executive committee at Banque Paribas, with which Compagnie bancaire merged.

[2][3] He has promised to pursue three goals: economic health, good working conditions, and above all, customer satisfaction,[4] which he has developed in his 2014 strategic plan, La Poste 2020.

[5] He implements a diversification strategy for La Poste's activities, developing, amongst others, home-care services for seniors,[6] and sessions of the driving licence written exam.

[7] In 2016, he signed a contract to take majority stakes in Axeo, a large network of local branches specializing in neighbourhood services.