Network Engineer in London

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Position DescriptionCGI is looking for an experienced Network Engineer to help shape the secure, scalable, and future‐ready network architectures that enable mission‐critical outcomes across our Space, Defence and Intelligence business. In this role, you will design and optimise advanced on‐premises and cloud network solutions, working closely with engineering, cloud, and security teams to deliver high‐value innovations that drive real operational impact. You\’ll have the autonomy to solve complex challenges, the scope to contribute creative ideas, and the support of a collaborative community committed to helping you thrive. This is an opportunity to take ownership of cutting‐edge network engineering in one of CGI\’s most influential and rewarding technical environments.

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 this programme, you will need to hold High Level Clearance or be willing to go through this clearance. This position will require on‐site work.

Your future duties and responsibilities

In this role, you will architect and deliver next‐generation network infrastructures spanning enterprise, virtualised, and cloud environments. You will take ownership of network design and integration, ensuring secure, resilient, and high‐performance connectivity across a diverse technology landscape. Working collaboratively with cloud, engineering, and security teams, you will shape modern network solutions that support client missions and high‐availability systems.

You\’ll apply creative engineering, automation, and observability tools to streamline operations, strengthen security posture, and future‐proof network platforms. Supported by a highly skilled community, you\’ll have the opportunity to influence architecture, introduce new ideas, and contribute to strategies that enable long‐term transformation.

Key Responsibilities

Design & Architect: Lead enterprise, virtual and cloud network designs across Cisco, Juniper, Arista and SDN/SD‐WAN ecosystems.

Engineer & Optimise: Deliver routing, switching, and service provider technologies including BGP, OSPF, EVPN/VXLAN and MPLS.

Secure & Protect: Implement advanced firewall, segmentation, PKI and zero‐trust controls across hybrid environments.

Automate & Streamline: Apply automation, scripting and intent‐based networking to enhance reliability and operational efficiency.

Integrate & Enable: Build cloud‐ready connectivity patterns across AWS, Azure and Google Cloud, including VPC/VNet design and interconnects.

Monitor & Improve: Use observability and WAN optimisation tools to ensure high performance across global infrastructures.

Required Qualifications To Be Successful In This RoleTo succeed in this position, you should bring strong experience designing and operating complex network infrastructures across enterprise, virtualised and cloud platforms. You\’ll be comfortable working with modern routing, switching, SDN/SD‐WAN, firewalls, PKI and cloud connectivity, with the ability to collaborate across multiple technical disciplines.

Essential Qualifications

Extensive hands‐on experience with Cisco, Juniper, and/or Arista networking platforms

Strong knowledge of BGP, OSPF, IS‐IS, EVPN/VXLAN, MPLS and high‐availability protocols

Experience with SD‐WAN technologies (Cisco SD‐WAN, Meraki, Aruba, Palo Alto Prisma)

Familiarity with AWS, Azure and/or GCP networking (VPC/VNet architecture, interconnects)

Experience with NSX‐T/V, Nutanix AHV or Hyper‐V networking

Strong understanding of firewalls, load balancers, PKI and segmentation

Ability to work within secure environments and meet UK clearance requirements

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.

Location: London, England, United Kingdom

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