Guillaume Mahe

Guillaume, an expert in IT audit, governance, and cybersecurity, with over 15 years of experience in complex and demanding environments. Certified CISA and ISO 27001 Lead Auditor, I support organizations in mastering their IT and cyber risks with a pragmatic and business-oriented approach.

I served as Head of IT Audit within a large international group, where I conducted audits for numerous subsidiaries worldwide. These missions covered the entire IT scope: governance, security, projects, operations, internal controls, and regulatory compliance.

As a consultant, I led cybersecurity audits, participated in security approval missions in the defense sector, and supported a major player in the banking sector in implementing and improving its IT risk management systems: maturity audits, risk mapping, risk analysis, continuous controls, integration of security into projects, and remediation monitoring.

What sets me apart is my ability to adapt requirements to the realities of your organization. I do not offer standard models disconnected from the field: I assess the size, maturity, and challenges of your structure to define the right level of control with concrete and prioritized recommendations.

What drives me is IT audit and governance, fully integrating the cyber aspect. I act as a proactive and advisory force to help structure, improve, and evolve practices, while strengthening risk management and the confidence of leaders.

I then support leaders, CIOs, and CISOs in their strategic decisions related to IT and cyber risks, providing them with a clear, structured, and operational vision. My goal: to secure critical activities, strengthen governance, and sustainably support business performance.