CGI UK Careers – Your mission found here By playing this video you consent to Google/YouTube processing your data and using cookies – Learn more. 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 a UK ‘Best Employer’ by the Financial Times. 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 5 days a week. Your future duties and responsibilities: In this role, you will design end-to-end network architecture aligned with system and infrastructure requirements, ensuring solutions are scalable, secure, and optimised for performance across cloud and on-premises environments. You will define standards, patterns, and best practices while guiding implementation to ensure alignment with architectural intent. You will work closely with engineering and delivery teams to support build and integration activities, ensuring network components are deployed effectively within the wider infrastructure. You will also optimise network performance, address capacity and latency challenges, and embed security-by-design principles, contributing to governance, documentation, and technical assurance. • Design & define end-to-end network architecture aligned to system requirements • Establish & maintain network standards, patterns, and best practices • Guide & support implementation and integration of network solutions • Collaborate & enable delivery teams to ensure correct deployment • Optimise & enhance network performance, capacity, and efficiency • Identify & resolve bottlenecks, latency, and failover challenges • Embed & enforce security-by-design, including segmentation and encryption • Produce & maintain high-quality HLDs, LLDs, and architecture diagrams • Contribute to design reviews, governance, and technical assurance Required qualifications to be successful in this role: You should have strong experience in network architecture within complex infrastructure environments, with deep knowledge of cloud and on-premises networking, security design, and performance optimisation. You will be confident communicating technical concepts and contributing to governance and design decisions. • Proven experience in network architecture, ideally within Defence environments • Strong knowledge of cloud networking and on-premises network design • Deep understanding of networking protocols and technologies (VLANs, SNMP, VPNs, TCP, BGP) • Expertise in network security design (firewalls, segmentation, zero-trust) • Experience with Kubernetes, including VKS • Ability to produce high-quality architectural documentation • Strong stakeholder communication and decision-making skills Desirable: • Experience with software-defined networking and network virtualisation • Familiarity with Infrastructure as Code (IaC) for network provisioning • Experience with network monitoring tools • Knowledge of SD-WAN and EVPN LI-SB2 Skills: Defense Defense Kubernetes Network Architecture Network Security 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.