Network Engineers

CGI's Space, Defence and Intelligence business unit, focuses primarily on the delivery of contemporary and innovative technical solutions for the government agencies most challenging problems. We work, build, and operate bespoke, technically complex, mission-critical systems which help our clients keep us all safe and secure. We are currently looking for an experienced cloud engineers to join our cross-functional team who, in partnership with our clients, will help define, guide and assure the delivery of integrated solutions. The role offers fantastic opportunities to work within an interesting and highly rewarding environment. We are heavily committed to developing our members and provide excellent learning and development opportunities to ensure that your knowledge and skills keep pace with the evolving technology landscape. We engender a culture of innovation, collaboration and ownership; highly motivated self-starters thrive within our organisation. Although we would like candidates to have all the skills we need, we would consider high quality individuals who meet most of the criteria Due to the secure nature of this project, this role requires candidates to either already hold, or be eligible to obtain, a high level of UK Security Clearance. To meet the eligibility criteria for this clearance, applicants must be sole British nationals, have been resident in the UK for the past 10 years, and must not have spent more than 28 consecutive days outside the UK within the last five years. Individuals who do not currently hold clearance are still encouraged to apply and will be considered both for this position and for other suitable opportunities within CGI where appropriate.

This role is primarily based on a secure client site and requires attendance on site five days per week due to the sensitive nature of the work and the systems involved. While the position is predominantly site-based, there may be occasional flexibility where business needs and security constraints allow. Any such arrangements would be agreed in advance with the project team.

In this role, you will provide hands-on expertise to maintain, support, and optimise enterprise network environments that enable critical services. You will take ownership of network stability and performance, working proactively to diagnose issues, implement improvements, and ensure environments remain secure, resilient, and fit for purpose.

You will also contribute to network modernisation initiatives, supporting transitions from legacy platforms to more contemporary solutions. Working closely with infrastructure, service management, and application teams, you'll help deliver controlled change, reduce risk, and continuously improve how network services are delivered.

Key responsibilities include:

Maintain & Optimise legacy and enterprise network infrastructure to ensure high availability

Diagnose & Resolve complex incidents across LAN, WAN, VPN, and data centre environments

Configure & Manage switches, routers, firewalls, and load balancers

Implement & Control network changes, patching, and upgrades through formal change processes

Document & Improve network configurations, dependencies, and technical procedures

Support & Deliver network modernisation and migration activities

Contribute & Collaborate in incident, problem, and capacity management processes

You will bring strong hands-on experience supporting complex network environments, with the confidence to take ownership of issues and contribute to continuous improvement. You are comfortable working with legacy technologies while supporting transition to modern platforms, and you thrive in collaborative, service-focused environments., * Cisco SD-WAN

• IP Networking
• Network Architecture
• Network Engineering
• WAN

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Proven experience supporting enterprise-scale network infrastructure

Strong knowledge of LAN, WAN, VPN, and data centre networking

Hands-on experience with switches, routers, firewalls, and load balancers

Demonstrated ability to diagnose and resolve complex network issues

Experience working within structured change, incident, and problem management processes

Strong documentation skills and attention to detail.

£61,779 per year - estimated ? Full time NEW CGI UK Careers - Your mission found here By playing this video you consent to Google/YouTube processing your data and using cookies - Learn more.

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 member 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.

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.