Expert CISO Security Architect – Critical Infrastructure & OT

Our client, a leading organization in the transportation and critical infrastructure sector, is seeking an Expert CISO Security Architect to secure their digital transformation. This role provides strategic guidance and technical oversight to mitigate cyber risks across mission-critical and commercial functions through holistic security design and risk management.

• Design and implement secure network architectures and protocols aligned with enterprise standards to protect against emerging cyber threats.
• Conduct comprehensive security risk assessments and oversee penetration testing to identify and remediate vulnerabilities in complex environments.
• Collaborate with business units and IT teams to integrate robust security requirements into the full lifecycle of digital projects.
• Provide expert guidance on compliance with international standards such as ISO 27001, IEC 62443, and NIST.
• Develop and implement threat modeling methodologies to enhance the existing risk management framework across the IT and OT landscape.
• Support incident response activities and conduct post-incident analysis to propose corrective measures and strategic improvements.

• You possess a Master’s degree in Cybersecurity, Computer Science, or Engineering.
• You have 10+ years of experience in Cybersecurity with at least 3 years in Critical Infrastructure or Defense.
• You bring 3+ years of experience in Operational Technology (OT), IoT, and Industrial Control Systems.
• You have 8+ years in security architecture across Network, Application, Data, SAP, ICAM, and PKI.
• You possess 8+ years with security monitoring and identity tools including SIEM, XDR, and Authentication protocols.
• You have 5+ years performing risk assessments, gap analysis, and threat modeling for large-scale implementations.
• You are trained or certified in ISO 27001 Lead Auditor, IEC 62443, or NIS2 Cyber Fundamentals.
• You can provide a reference from a previous employer in critical infrastructure or defense.
• You're a strong communicator with synthesis skills and a solution-oriented mindset.
• You are fluent in English (C1) with proficiency (C1) in either French or Dutch.

Nice to Haves

• Experience with Cloud and ERP security integrations.
• Knowledge of Belgian cybersecurity laws and European Union regulatory frameworks.
• Change management skills in large-scale technical environments.

• Start date: 13/07/2026.
• Duration: until 31/05/2028.
• Work regime: Full-time.
• Location: Brussels.
• Working model: Hybrid with onsite presence in Brussels as required.
• Contract: open to both permanent employees and freelancers.