Senior Network Engineer (DV Security Clearance)

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 which help our clients keep us all safe and secure. We bring innovation to our clients using proven and emerging technologies, agile delivery processes and our deep expertise across the breadth of space, defence, intelligence, aerospace and maritime, all underpinned by our end-to-end cyber capability. We work collaboratively with global technology companies, cutting edge SMEs and academia to deliver the optimal solution for each client.

Due to the secure nature of the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This position will be based on site near Chippenham.

Your future duties and responsibilities

We are looking for a highly skilled and experienced Senior Network Engineer to join our team. This role is primarily support-focused, with opportunities to contribute to network integration and design projects. The ideal candidate will have deep technical expertise in advanced networking technologies, ensuring the stability, security, and scalability of our infrastructure. This position includes participation in an on-call rota to support business-critical systems.

Key Responsibilities:

• Network Operations & Support: Provide advanced troubleshooting for Dell OS10, Sonic switches, Cisco firewalls, switches, routers, Palo Alto firewalls, and NSX-T. Manage and maintain spine and leaf architectures, BGP, VPN configurations, and data centre patching. Ensure high availability and performance of network services.
• Integration & Design: Contribute to the design and integration of new network solutions to meet evolving business needs. Collaborate with cross-functional teams to implement network improvements and expansions. Maintain detailed network design documentation for operational transparency.
• Infrastructure Management: Oversee IP address management and DNS configuration. Configure and optimise load balancing solutions (F5 experience is highly desirable). Integrate and manage InfoBlox solutions where applicable.
• Collaboration & Leadership: Provide technical guidance and mentorship to junior engineers. Work closely with other infrastructure teams to align network operations with broader IT strategies.
• On-Call Support: Participate in an on-call rota to resolve critical incidents outside of business hours.

Required qualifications to be successful in this role:

• Defence sector experience or experience in a highly regulated environment.
• Proven experience in a senior network engineering role, with a focus on support, integration, and design.
• Expertise in: Dell OS10, Sonic switches, Cisco firewalls, switches, and routers, Palo Alto firewalls and NSX-T, deep understanding of spine and leaf architecture, BGP, VPNs, and data centre patching. Strong knowledge of load balancing, DNS, and IP address management (F5 and InfoBlox experience is highly desirable).
• Excellent problem-solving, analytical, and communication skills.

Desired Competencies:

• Understanding of cross-domain technologies (Tiger Traps, Garrison, OpsWat, NiFi).
• Familiarity with VMware infrastructure technologies.
• Experience using Elastic for monitoring and analytics.

This is an exciting opportunity to work with cutting-edge network technologies in a dynamic and high-impact environment. If you thrive in network support and infrastructure design, we’d love to hear from you!