Network Engineer (DV Security Clearance)

CGI Group Inc.; Gloucester; On-site; GBP 55,000 - 75,000; Full time

Job summary

A technology consulting firm in Gloucester is seeking a skilled Software Defined Networking Engineer to lead the design and deployment of advanced network infrastructures. You will leverage Cisco ACI and VMware NSX-T to deliver robust solutions across hybrid environments. The ideal candidate will have significant experience in SDN principles and cloud networking. This position requires UK Security Clearance.

Qualifications

• Proficiency in Cisco ACI fabric design and operations.
• Hands-on experience with VMware NSX-T infrastructure setup.
• Knowledge of network automation and orchestration tools.

Responsibilities

• Design, deploy, and manage scalable SDN architectures using Cisco ACI.
• Integrate SDN platforms with hybrid infrastructures.
• Diagnose and resolve complex network issues across environments.

Skills

Cisco ACI expertise

VMware NSX-T experience

SDN principles understanding

Cloud networking familiarity

Network automation skills

Tools

Ansible

Terraform

vRealize Network Insight

Job description

Overview

The Space, Defence and Intelligence business unit in CGI is a true IT Systems Integrator. We work, build, and operate bespoke, technically complex, mission-critical systems to help our clients stay secure. We bring innovation to our clients using proven and emerging technologies, agile delivery processes, and deep expertise across space, defence, intelligence, aerospace and maritime, underpinned by end-to-end cyber capability. We are seeking a highly skilled and forward-thinking Software Defined Networking (SDN) Engineer to lead the design, deployment, and optimisation of advanced network infrastructures. You will leverage expertise in Cisco ACI and VMware NSX-T to deliver software-defined solutions across complex hybrid environments, collaborating with cross-functional teams to ensure robust, scalable, and secure network fabrics that support on-premises and cloud platforms.

Responsibilities

• Design, deploy, and manage scalable Software Defined Networking (SDN) architectures using Cisco ACI.
• Define and enforce policies and connectivity rules within SDN environments.
• Deploy and manage VMware NSX-T for micro-segmentation, distributed firewalling, and advanced routing.
• Implement dynamic routing protocols and integrate with underlay networks.
• Establish security zones and enforce granular access controls through logical segmentation.
• Integrate SDN platforms with hybrid infrastructures, including public cloud providers and on-premises data centres.
• Collaborate with cloud and systems engineering teams to ensure seamless interconnectivity and performance optimisation.
• Diagnose and resolve complex network issues spanning virtual and physical environments.
• Use packet capture, flow analysis, and SDN analytics to pinpoint performance bottlenecks and security anomalies.
• Provide escalation support and participate in root cause analysis for critical incidents.

Qualifications

• Proficiency in Cisco ACI fabric design and operations.
• Hands-on experience with VMware NSX-T infrastructure setup and security features.
• Deep understanding of SDN principles, overlay/underlay concepts, and VXLAN architecture.
• Familiarity with cloud networking (AWS, Azure, GCP) and hybrid deployment models.
• Solid troubleshooting and diagnostic skills across Layer 2 of the OSI model.
• Knowledge of network automation and orchestration tools (e.g., Ansible, Terraform).
• Experience with network monitoring platforms (e.g., vRealize Network Insight, Cisco Nexus Dashboard).
• Familiarity with Zero Trust Networking and Network Function Virtualisation (NFV).
• Certifications such as Cisco CCNP/CCIE Data Center, VMware VCP-NV, or VCIX-NV are desirable.

Other requirements: Due to the secure nature of the programme, UK Security Clearance or eligibility to obtain clearance will be required. This position will be based at our site in Cheltenham.