Senior Network Engineer (DV Security Clearance)

CGI; Chippenham; On-site; GBP 60,000 - 80,000; Full time

Job summary

Join CGI as a Senior Network Engineer and leverage advanced networking technologies to support critical business systems. This role involves a mix of support-focused tasks and opportunities to design innovative network solutions while ensuring the stability and security of infrastructures. Candidates with Defence sector experience and strong technical backgrounds are preferred.

Benefits

Competitive salary

Excellent pension

Private healthcare

Share scheme

Qualifications

• Proven experience in a highly regulated environment, preferably defence sector.
• Expertise in network design, integration, and support.
• Strong understanding of networking technologies and troubleshooting.

Responsibilities

• Provide advanced troubleshooting for network devices and manage configurations.
• Contribute to design and implementation of new network solutions.
• Mentor junior engineers and participate in on-call support.

Skills

Network Administration

Problem-solving

Analytical skills

Detail-oriented

Communication

Education

Experience in a senior network engineering role

Tools

Dell OS10

Cisco Firewalls

Palo Alto Firewalls

NSX-T

F5

InfoBlox

Job description

Senior Network Engineer (DV Security Clearance)

Position Description:

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.

CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named one of the ‘World’s Best Employers’ by Forbes magazine. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching) which makes you a CGI Partner not just an employee. We are committed to inclusivity, building a genuinely diverse community of tech talent and inspiring everyone to pursue careers in our sector, including our Armed Forces, and are proud to hold a Gold Award in recognition of our support of the Armed Forces Corporate Covenant. Join us and you’ll be part of an open, friendly community of experts. We’ll train and support you in taking your career wherever you want it to go.

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!

#LI-JS2

Skills:

• Defense
• Defense
• Network Administration
• Detail-oriented

What you can expect from us:

Together, as owners, let’s turn meaningful insights into action.

Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…

You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.

Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.

You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.

Come join our team—one of the largest IT and business consulting services firms in the world.

About the company

CGI Inc., also known as CGI Group Inc.,

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