Deefense

Founded in 2025, Deefense is a cybersecurity company based in Nancy, France working in managed security, detection & response, penetration testing +8 more.

Deefense is a French cybersecurity and IT managed services firm founded in 2025, headquartered in Nancy, with offices in Strasbourg and Metz. It serves small and medium-sized industrial, construction, logistics and professional services companies in the Grand Est region and across France. Its offering combines cybersecurity (audits, penetration testing, 24/7 supervision, EDR/MDR, incident response, backup and security awareness training) with IT outsourcing (infogérance, maintenance, support and IT asset management). Deefense also provides compliance support for NIS2, ISO 27001 and GDPR, including gap analyses, applicability diagnostics, documentation and outsourced CISO (RSSI externalisé) services. The company does not act as a certification body; it supports clients through certification audits and ongoing surveillance.