Location: Caerphilly (with travel to client / Ministry of Defence sites as required)
Clearance: SC (must hold or be eligible); DV highly desirable
Salary: 75,000 + Bonus + Comprehensive Benefits Package

About the Role
A major Defence programme is seeking a highly skilled Senior Network Infrastructure Engineer to lead the design, implementation and ongoing support of secure, resilient, multi-domain network services. You will work across datacentre networks, secure LAN/WAN, SDN enabled virtualised environments, and deployed operational sites - ensuring high availability, compliance and adaptability in a mission critical environment.

Key Responsibilities
* Lead the design, configuration and support of secure multi-site LAN/WAN/SDN infrastructure.
* Configure and optimise enterprise switching platforms (e.g., Cubic M3X S8G / S24G, Cisco ESS3300 based).
* Implement routing protocols including BGP, MPLS, VPLS, and HA technologies.
* Configure firewalls, VPNs, IDS/IPS and boundary protection systems.
* Support virtualised routing and SDWAN technologies (Cisco Catalyst 8000V).
* Act as senior escalation point for complex incidents.
* Ensure compliance with MOD security standards and Secure by Design principles.
* Maintain documentation, diagrams and CMDB records.
* Support accreditation processes (IT Health Checks, CCVAs).
* Contribute to network automation (Python, Ansible, PowerShell).
* Identify opportunities for architectural improvement.

Essential Experience
* Extensive multi-site LAN/WAN experience.
* Advanced configuration skills on Cisco and Cubic platforms.
* Deep knowledge of BGP, MPLS, VPLS and segmentation.
* High availability technologies (HSRP/VRRP equivalents).
* DNS, DHCP, NAT, IP planning.
* Experience in secure or Defence oriented environments.
* ITIL?based service management.

Desirable Experience
* VMware NSX and SDN, SDWAN and virtualised routing, VoIP, QoS, SIEM/log analysis tools. Knowledge of JSP, ISO 27001, NIST. Experience leading technical projects.
* Existing SC/DV clearance.

Qualifications
* Cisco CCNP (required); CCIE desirable.
* ITIL v4 Foundation or above.
* Degree in Computer Science, Network Engineering or equivalent experience.

Personal Qualities
* Strong communicator.
* Analytical problem solver.
* Able to mentor and lead.
* Customer centric and proactive.

If you are a Senior Network Infrastructure Engineer with experience working in or with the Defence sector and looking for an exciting new challenge, please send your CV to me today.