Skills

Incident Response Risk Management Monitoring Configuration Management Training SharePoint Online

Job Specifications

Job Title: Senior Information Security Manager

Language: English

Location: Brussels, Belgium

Duration: 02/01/2026-31/12/2026

Work Mode: Hybrid (2 or 3 days onsite per week)

Work regime: Full time

Job Description - Roles and Responsibilities

Mission

Develop and maintain security strategy and governance framework.
Create, update, and manage ISMS documentation including the ISMS Manual, SoA and oth-er compliance documentation.
Drive the full policy lifecycle: drafting, stakeholder review, legal review, publication, com-munication, and regular ISMS review cycles
Ensure compliance with ISO 27001:2022, NIS2, ISAE 3000 (Type 1/2), OPDE/MVS, and other relevant standards.
Collaborate with suppliers to ensure security requirements are met.
Ensure security design integration for the Configuration Management Database (CMDB)
Oversee operational security processes including access control, monitoring, and incident response.
Contribute to SOC development and harmonize monitoring requirements.
Manage vulnerability assessments and remediation plans.
Develop CN-specific continuity scenarios and support the creation/monitoring and testing of BCM/DR plans
Ensure user training, awareness activities, and publication of materials
Prepare and ensure internal and external audits.
Lead the corrective action and continuous improvement process following audit findings
Provide regular security posture reports to management and steering committees.

Requirements

Expertise in ISO 27001:2022, NIS2, ISAE 3000 audit models, and MVS OPDE and other security frameworks.
5+ years of experience in security management roles.
Experience in multi-supplier ecosystems and documentation-heavy environments.
Strong knowledge of cybersecurity risk management and audit processes.
Experience in operational security, including access control and incident response.
Familiarity with supplier security, ITSM process evaluation and hosting/data-center security.
Knowledge of vulnerability management and monitoring tools.
Proficiency in SharePoint Online
Knowledge of energy sector ecosystem and operational structures (e.g. ENTSO-E, TSOs, RCCs, etc.)
Fluent in English

About the Company

OneSource is a pan European based recruitment, employment agency founded in response to the market demands for more flexible, cost-effective, tailored recruitment solutions. It aims at providing high-quality services to provide the best outcomes in the recruitment and employment of personnel from a diverse set of business sectors. In today's highly competitive and ever-changing IT market, hiring the right candidate can make the difference between success and failure of any mission-critical project. We can navigate you throu... Know more