Software Defined Network Engineer - Cisco ACI and VMware NSX-T (SC Clearance)

In this role, you will design, deploy, and manage software-defined networking solutions across hybrid environments, ensuring secure, scalable, and high-performing network architectures. You will take ownership of SDN platforms, working with technologies such as Cisco ACI and VMware NSX-T to deliver robust connectivity, segmentation, and policy-driven network control aligned to business and technical requirements.

You will collaborate closely with cloud, infrastructure, and security teams to optimise network performance and resilience. Within a supportive and expert-led environment, you will contribute innovative solutions, troubleshoot complex issues, and continuously enhance network capabilities to support mission-critical delivery.

• Design & Deliver SDN architectures using Cisco ACI and VMware NSX-T

• Configure & Manage network policies, segmentation, and connectivity rules

• Integrate & Optimise hybrid environments across on-prem and cloud platforms

• Troubleshoot & Resolve complex network issues across virtual and physical layers

• Secure & Enforce network controls including micro-segmentation and access policies

• Collaborate & Align with cloud, infrastructure, and security teams

• Monitor & Improve network performance using advanced analytics and tooling

You should have strong experience in software-defined networking, with proven expertise in Cisco ACI and VMware NSX-T within enterprise or secure environments. A deep understanding of modern networking concepts and the ability to operate across hybrid infrastructures is essential.

• You should have proven experience with Cisco ACI and VMware NSX-T

• Strong understanding of SDN principles, VXLAN, and overlay/underlay architectures

• Experience with hybrid cloud networking (AWS, Azure, or GCP)

• Strong troubleshooting skills across Layer 2-7 networking

• Familiarity with network security, segmentation, and Zero Trust principles

• Knowledge of automation tools (e.g., Ansible, Terraform) is advantageous

• Relevant certifications (e.g., CCNP/CCIE, VCP-NV) are desirable

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 Gloucester 5 days a week.

At CGI, our Space, Defence and Intelligence business unit delivers mission-critical systems that help keep the UK safe and secure., 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.