Senior Network Security Engineer – Cisco ACI
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Our client, a leading organization in the energy infrastructure sector, is seeking a Senior Network Security Engineer to oversee the security and operations of a multi-site network environment. The role involves managing complex IT and OT systems to ensure 24/7 service availability while supporting large-scale connectivity and modernization projects across Europe.
Responsibilities
- Manage and secure network operations within both IT and OT environments to ensure continuous service availability.
- Prepare and execute technical changes with high diligence to maintain stability across critical systems.
- Design and deploy connectivity solutions for data centers and cloud-integrated infrastructures.
- Maintain and modernize wide-area network (WAN) architectures and enterprise routing protocols.
- Collaborate with cross-functional ICT teams to support network services across multiple European locations.
- Implement and manage network security frameworks including firewalls and access control systems.
Requirements
- 8+ years of experience in network engineering with a focus on Cisco technologies.
- Advanced knowledge of routing and switching protocols including OSPF, ISIS, MP-BGP, and MST.
- Proven experience with Cisco ACI, Cisco SD-WAN, and Cisco Wireless solutions.
- Hands-on experience with firewall technologies from Checkpoint and Palo Alto.
- Expertise in cloud networking specifically within Microsoft Azure environments.
- Experience using Python or Ansible for network automation and orchestration.
- Knowledge of backend monitoring and security tools such as Zabbix, Elastic, ISE, and NAC.
- Willingness to participate in a standby rotation (maximum one week in four).
- Proactive team player with the ability to work independently in a complex technical environment.
- You are fluent in English with proficient knowledge of Dutch or French.
Nice to Haves
- Familiarity with TACACS and RADIUS servers.
Offer
- Start date: 28/09/2026
- Duration: 1 year (renewable)
- Work regime: Full-time
- Location: Brussels
- Working model: Hybrid (initial 3 months full-time onsite, followed by 3 days per week onsite)
- Contract: open to both permanent employees and freelancers
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