Network Architect (DV Security Clearance)

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

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

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.

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. Discover CGI London, England, United Kingdom > 1000 employees IT services We are a global business with 91,500 professionals across hundreds of locations worldwide, providing end-to-end IT and business process services that drive our clients' businesses. In the UK alone, we have around 6,000 member-partners working across 19 towns and cities, doing everything from writing complex code to designing sophisticated software solutions. The work we do powers some of the most ambitious projects that touch the lives of many. Our approach sets us apart, characterised by our proximity model, international presence, expertise, and operational excellence. We organise our operations within metro markets where our clients have concentrated footprints, empowering our local teams to build trusted, in-person relationships. As you build your career here, you'll develop your skills, share your insights, and work side-by-side with colleagues and clients on innovative solutions that address the most complex issues. Our commitment to ownership, flexibility, and being approachable makes us easy to do business with. Join us, and together, as owners, let's turn meaningful insights into action to meet the needs and balance the interests of our clients, shareholders, communities, and each other. Benefits: - Insurance coverage - Medical benefits - Pension plan - Member Assistant Programme - Check4Cancer - Flexible time off - Share Purchase Plan - Member discounts - Dental benefits - Vision benefits - Profit Participation Plan - Health and Wellbeing Programme