Our Client is seeking a Senior Network Security Engineer to strengthen its cybersecurity posture and ensure the protection, performance, and reliability of its network infrastructure.
You will play a key role in designing, securing, monitoring, and troubleshooting critical network components to safeguard the organisation against cyber threats.
This role combines network engineering, security operations, incident response, and infrastructure hardening, in close collaboration with internal IT teams.
Job Description
Key Responsibilities
1. Network Security Design & Implementation
Design, configure, and maintain security solutions (firewalls, VPNs, proxies, load balancers, WAF, etc.).
Deploy protection mechanisms to prevent intrusions and unauthorized access.
Contribute to the continuous improvement of network security architecture.
2. Network Monitoring & Performance
Continuously monitor network activity to detect anomalies or attacks.
Perform regular security audits and vulnerability assessments.
Analyse alerts and logs, responding to incidents in real time.
3. Troubleshooting & Advanced Technical Support
Investigate, diagnose, and resolve complex network and security issues.
Provide Level 3 support and collaborate with technical and non‑technical teams.
Participate in incident response and post‑incident remediation activities.
Qualifications
Technical Skills Required
Network & Routing
Strong understanding of routing/switching (static routing, OSPF, BGP).
Experience with routers, switches, WiFi, DNS, TACACS, ISP connectivity, ExpressRoute, and related technologies.
Security Technologies
Expertise with:
Firewalls (e.g. Palo Alto, Fortinet, CheckPoint, Cisco ASA)
VPN technologies
Forward & reverse proxies
Load balancers (e.g. F5, Citrix)
WAF & reverse proxy solutions
Cloud & Secure Access
Understanding of cloud security principles (data protection, access control).
Knowledge of Zero Trust Network Access (ZTNA).
Incident Detection & Response
Ability to detect threats, manage incidents, and support vulnerability remediation.
Experience with threat analysis and security operations.
Automation & Scripting
Ability to automate tasks using scripting languages.
Operating Systems & Protocols
Familiarity with network‑related operating systems and encryption standards.
Soft Skills
Strong communication skills with technical and non‑technical stakeholders
Excellent problem‑solving abilities
Ability to manage pressure and multiple priorities
Leadership and mentoring capabilities
Autonomy combined with strong teamwork
Curiosity and openness to new technologies
High attention to detail and quality
Language Requirements
Excellent level in French or Dutch
Good level in the second national language
Good command of English
Certifications (Nice to Have)
Security/network certifications such as:
CCNP Security
Palo Alto PCNSE
Fortinet NSE
F5 certifications
CISSP
Evidence of ongoing professional training in network security
Additional Information
Additional Information
Candidates must have a valid work and residence permit for Belgium (if non-EU)
The client values diversity and inclusion, offering a positive work culture focused on well-being
Opportunity to contribute to innovative, ground-breaking technologies in the energy sector
Seniority level
Mid-Senior level
Employment type
Full-time
Job function
Information Technology
Industries
Software Development