Head of Infrastructure & Network Security - Freelance

Start date: mid-August
Location: La Defense — international scope (multi-country group)
Reporting line: Group CISO / Security Management

This role involves daily international interactions, committee facilitation, and executive reporting in English with multi-country stakeholders.

Context :

As part of strengthening its security governance, the group is looking for an Head of Infrastructure & Network Security able to drive the information security strategy across an international, multi-country scope.
The role combines deep technical expertise (infrastructure, network, cloud) with high-level governance capabilities: cross-functional leadership, budget arbitration, vendor management, and strategic vision at group level.

Key responsibilities :

Governance & security strategy (international group) :

• Define and drive the infrastructure security strategy across multiple countries

• Roll out the group ISSP (Information System Security Policy) and ensure consistency between local entities and central functions

• Lead security governance bodies (steering committees, risk committees) and executive reporting to top management

• Ensure multi-jurisdiction regulatory compliance (ISO 27001, NIS2, GDPR depending on sectors)

• Oversee risk assessments (EBIOS RM) and remediation plans across the infrastructure scope

Budget & vendor management :

• Build and manage the infrastructure security budget for the scope

• Select, contract, and manage service providers and integrators (MSSP, vendors, consultancies)

• Arbitrate investments and optimize the value/cost ratio of security measures

Infrastructure, network & cloud security :

• Oversee the security architecture of infrastructures: datacenters, network, cloud (AWS/Azure/GCP), hybrid environments

• Drive the hardening of technical foundations: segmentation, hardening, IAM/PAM, PKI, backup/DRP

• Ensure a strong detection and response posture (SOC, EDR, SIEM) in coordination with operational teams

Coordination & cross-functional leadership :

• Coordinate local CISOs and security officers across entities

• Support change management and foster a security culture across the group