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 SD‑WAN 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, SD‑WAN 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.