Swiss fintech Additiv is losing one of its longest-serving top executives to a major consulting firm. 

Manuel Thomet is leaving Zurich-based finance start-up Additiv to become head of financial services at Publicis Sapient, according to a statement on Monday. Most recently, Thomet was head of Additiv's consulting and strategy; he was part of top management for the past seven years.

At Publicis Sapient, which is subsidiary of French ad giant Publicis, Thomet joins an team of 50 people in Zurich focused on digitization and innovation projects for the Swiss financial sector. Prior to Additiv, he worked for Swisscom's technology arm and for Swiss bank Credit Suisse.