Join a multidisciplinary security and infrastructure team responsible for safeguarding a national-scale IT environment. As a Senior IT Security Specialist, you’ll play a key role in securing network and application layers, managing advanced firewall and load-balancing technologies, and ensuring the integrity and resilience of mission-critical systems.
You combine hands-on technical expertise with a proactive approach to risk management, incident response, and system hardening.
Your Role
- You ensure the implementation and compliance of IT security policies and standards.
- You regularly assess and monitor the security posture of complex systems and networks.
- You manage and optimize enterprise-grade security infrastructure, including Palo Alto firewalls and F5 BIG-IP components.
- You react effectively to incidents such as intrusions, malware, or coordinated attacks, and prepare response scenarios.
- You analyze and mitigate vulnerabilities across Windows, Linux, iOS, and Android environments.
- You design secure solutions for partner, intranet, and internet connectivity.
- You advise management through risk analyses and technical recommendations.
What are we looking for?
- 5+ years of professional experience as an IT Security Specialist in enterprise environments.
- Proven, hands-on experience with:
- F5 BIG-IP (minimum 10 years), including APM, ASM/AWAF, LTM, GTM, SSL VPN, and Identity Provider integration.
- Palo Alto Firewalls (5+ years), including configuration, operations, and Panorama management.
- VPN and Web Proxy solutions (5+ years).
In-depth understanding of TCP/IP, HTTP/HTTPS, SSL, SNMP, and stateful firewall architectures.
Experience with endpoint protection, antivirus systems, and content inspection engines (mail, web).
Knowledge of monitoring and log correlation tools such as Splunk, Nessus, and ELK.
Proficiency with Microsoft Azure, Windows Server, and Red Hat Enterprise Linux.
Familiarity with encryption algorithms (RSA, DES, AES, etc.) and Wi-Fi security (WPA2, WPA3).
Bachelor’s or Master’s degree in Computer Science, Electronics, or a related technical field.
Languages: Dutch, French, and English – active knowledge required (at least two national languages and English at a technical level).
What do we offer?
Location: Brussels (hybrid)
Contract: Freelance or Permanent
Start date: 1 November 2025
Duration: Until end of 2025 (extendable