Denis Dumartin has extensive experience in technical maintenance and management roles, currently serving as the Responsable technique maintenance et travaux neufs at Groupe Coopératif Maïsadour since January 2001. Responsibilities include overseeing maintenance for a Seveso industrial site and a network of 36 self-service stores, managing a team of multidisciplinary technicians, and coordinating with external service providers. Additionally, Denis Dumartin has held positions such as Assistant Technique and Technicien Maintenance Mécanique, focusing on mechanical maintenance for silos and collection centers. Concurrently, since April 2014, Denis Dumartin has served as the Mayor of Horsarrieu, a community of 700 residents. Denis Dumartin holds a BTS in Maintenance Industrielle from Lycée de Borda.