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

Position Description:

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

As a Software Defined Network Engineer you will play a critical role in designing and delivering next-generation network solutions that enable secure scalable and high-performing environments. Working across complex hybrid infrastructures you will help drive innovation through software-defined technologies contributing to impactful programmes. Youll take ownership of advanced networking solutions apply creative approaches to complex challenges and collaborate within a supportive environment that enables continuous growth and meaningful impact.

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 youll be part of an open friendly community of experts. Well 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.

Your future duties and responsibilities:

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

Required qualifications to be successful in this role:

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 27 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

#LI-SB2

Skills:

• Cisco ACI

What you can expect from us:

Together as owners lets turn meaningful insights into action.

Life at CGI is rooted in ownership teamwork respect and belonging. Here youll 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. Thats why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our companys strategy and direction.

Your work creates value. Youll 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.

Youll shape your career by joining a company built to grow and last. Youll 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 teamone of the largest IT and business consulting services firms in the world.