Overview
At CGI, we empower our technical experts to redefine what's possible in secure network design. As a Network Architect, you will reimagine and modernise network architecture that underpins complex, air-gapped, virtualised environments. Your work will influence mission-critical infrastructure, ensuring resilience, scalability, and security across a highly secure programme. You will collaborate with engineers and testers to deliver advanced, high-performance solutions that enable transformation, innovation, and enduring client success. You will lead the redesign and optimisation of complex, multi-environment network architectures, focusing on modernising connectivity across air-gapped and virtualised infrastructures. You will own technical direction, ensuring secure, high-performing designs that meet client and programme objectives. You will work closely with infrastructure, test, and security teams to produce high-quality technical documentation and guide implementation through to validation and delivery. You will shape secure network solutions that balance innovation and reliability, within a collaborative environment that values initiative, creative problem-solving, and precision in execution.
Key responsibilities
* Lead & Innovate: Redesign existing network architecture integrating modern layer 3 switches, layer 2 switches, routers, and firewalls.
* Design & Deliver: Produce detailed High-Level (HLD) and Low-Level (LLD) network designs, ensuring alignment with secure system requirements.
* Collaborate & Support: Partner with test teams to provide consultation on appropriate test design and validation approaches.
* Optimise & Automate: Enhance network performance and reliability through modernisation and configuration best practice.
* Advise & Influence: Serve as a technical authority on network security, architecture, and system interconnectivity.
You should bring strong experience in designing and implementing secure, virtualised network architectures, with deep knowledge of routing, switching, and firewall configurations. A proactive, detail-focused approach and the ability to work in a highly secure, collaborative environment are essential.
Essential skills and experience
* Proven experience designing and deploying complex, secure network architectures.
* Strong understanding of Layer 2 and Layer 3 switching and routing principles.
* Hands-on experience with Juniper SRX firewalls (e.g., SRX240) and Cisco Layer 2 switches (e.g., Cisco 2960).
* Experience with Dell switches, VMware virtualisation, and Windows Server environments.
* Familiarity with Mini Catapans or similar air-gapped networking solutions.
* Ability to produce detailed HLD/LLD documentation and collaborate effectively with testing and implementation teams.
Life at CGI
Life at CGI is rooted in ownership, teamwork, respect and belonging. You are invited to be an owner from day 1 as we work together to bring our Dream to life. CGI Partners share in collective success and actively shape the company’s strategy and direction. Your work creates value, and you’ll develop innovative solutions while building relationships with teammates and clients. We offer global capabilities to scale ideas, embrace opportunities, and access expansive industry and technology expertise. You’ll be supported by leaders who care about health and well-being and provide opportunities to deepen skills and broaden horizons. CGI was recognised in the Sunday Times Best Places to Work List 2025 and 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). We are committed to inclusivity and a diverse tech talent community, including support for the Armed Forces. This is a full-time, on-site position based in Reading, and due to the secure nature of the programme, you will need UK Security Clearance or be eligible to obtain it.
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