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Claude Koestner joined Crédit Industriel et Commercial in 1996, where he began his career as a retail bank manager. He was subsequently appointed corporate branch manager at Crédit Industriel d’Alsace et de Lorraine (CIAL), responsible for large corporates.

Between 2016 and 2020, Claude Koestner was Chief Executive Officer of CIC Est, a regional retail bank that covers 17 departments in eastern France. Alongside this role, he was appointed Deputy Chief Executive Officer of CIC in 2017 and Chairman of the Executive Board of the Banque Européenne du Crédit Mutuel (BECM) in 2020.

In January 2024, he was appointed Chief Operating Officer of CIC, responsible for the network activities, retail banking and the five regional banks (CIC Nord Ouest, CIC Ouest, CIC Est, CIC Sud Ouest and CIC Lyonnaise de Banque), while continuing to serve as Chairman of BECM.

In June 2026, Claude Koestner was appointed Chief Executive Officer of Crédit Mutuel Alliance Fédérale.