Senior IT Security Engineer; SecOps & Infrastructure Security

Senior IT Security Engineer (Sec Ops & Infrastructure Security)

We are seeking a Senior IT Security Engineer to strengthen a cybersecurity team supporting critical infrastructure organizations. The role focuses on operational security, security monitoring, incident response, infrastructure hardening, and security governance across multiple client environments. Working closely with the CISO and security teams, you will help improve cybersecurity resilience, regulatory compliance, and overall security posture.

• Administer, configure, and optimize security platforms including SIEM, EDR/XDR, vulnerability management, and monitoring tools.
• Monitor and manage SOC alerts, perform investigations, coordinate escalations, and support incident response activities.
• Develop and maintain detection rules, dashboards, alerts, use cases, and security playbooks.
• Participate in incident containment, root‑cause analysis, remediation, and reporting.

• Secure and maintain client environments including servers, networks, cloud platforms, and firewalls.
• Deploy, configure, and optimize security solutions such as EDR, SIEM, IDS/IPS, and anti‑malware technologies.
• Lead or contribute to security improvement initiatives, including vulnerability management programs.
• Conduct technical security reviews and recommend remediation actions.
• Apply security hardening standards and benchmarks (CIS, NIST, ANSSI).
• Document security architectures, configurations, and operational procedures.

• Contribute to technical risk assessments and security reviews.
• Support NIS2 compliance initiatives and cybersecurity governance activities.
• Assist in the development of security policies, procedures, and operational standards.
• Support internal and external audits.
• Produce security dashboards, KPI reports, and security posture assessments.

• Provide security expertise to infrastructure, network, development, and support teams.
• Participate in security awareness and knowledge‑sharing initiatives.
• Act as a trusted technical advisor on security‑related projects.

• Strong experience with Windows Server and Linux environments.
• Solid knowledge of network security concepts:
  • Firewalls
  • VPNs
  • VLANs
  • Routing and segmentation
• Hands‑on experience with:
  • SIEM platforms
  • EDR/XDR solutions
  • SOC operations and monitoring
  • Vulnerability management
  • Incident response

• Experience with Microsoft Azure, Entra , Microsoft 365, and Microsoft Security solutions is highly desirable.
• Understanding of Identity and Access Management (IAM) concepts.

• Knowledge of NIS2, ISO 27001, and cybersecurity best practices.
• Experience applying CIS, NIST, or ANSSI security benchmarks.
• Understanding of CVEs, vulnerability scoring, remediation processes, and risk management.

• Strong analytical and troubleshooting capabilities.
• Excellent communication skills with both technical and non‑technical stakeholders.
• Autonomous and proactive working style.
• Strong documentation and reporting skills.
• Customer‑oriented mindset with experience supporting multiple stakeholders.
• Team player with strong collaboration skills.

• 5‑7+ years of experience in cybersecurity, Sec Ops, or security‑focused infrastructure engineering.
• Proven experience administering and operating security monitoring and protection platforms.
• Experience working with SOC teams and security incident management.
• Experience in MSP, MSSP, or multi‑client environments is a strong advantage.
• Relevant certifications such as SC‑200, MS‑500, CySA+, CEH, or similar are considered assets.

• French:
  Fluent
• English:
  Professional technical proficiency

• Couillet, Belgium
• Hybrid working model

• Long‑term consulting assignment with extension potential based on project needs and performance.