Network Engineer

Position

Description:

Join CGI’s Space, Defence and Intelligence business unit as a Network Engineer specialising in Software Defined Networking, where you’ll help shape the secure, resilient networks supporting critical programmes. Working with technologies including Cisco ACI and VMware NSX-T, you’ll design and deliver innovative network solutions that enable seamless connectivity across complex hybrid environments. You’ll take ownership of technical challenges, collaborate with experienced specialists and have the support to develop your expertise while delivering meaningful outcomes.

At CGI, your ideas and skills will help strengthen essential infrastructure, drive innovation and make a lasting impact on some of the UK’s most important secure programmes.

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 ideally already hold Security Clearance. Candidates who are eligible and willing to undergo the clearance process will also be considered. This is a long-term opportunity requiring five days per week on site in Belfast. Remote or hybrid working is not available for this position.

Your future duties and responsibilities:

In this role, you will take ownership of designing, deploying and optimising secure Software Defined Networking solutions that underpin critical defence and intelligence programmes. Working with Cisco ACI and VMware NSX-T, you will develop scalable, resilient network architectures that connect on-premises infrastructure with cloud environments, ensuring high performance, security and operational reliability.

You will collaborate with network, cloud and infrastructure specialists to solve complex technical challenges, introduce innovative approaches and continuously improve network capabilities. Supported by CGI’s collaborative community of experts, you will have the opportunity to influence technical decisions, strengthen security and contribute to the long-term success of mission-critical services.

Key responsibilities:

• Design & Deliver:
Architect, deploy and manage scalable SDN environments using Cisco ACI and VMware NSX-T.
• Secure & Protect:
Implement micro-segmentation, distributed firewalling, security policies and granular access controls.
• Integrate & Connect:
Enable seamless connectivity between on-premises data centres and cloud infrastructure.
• Optimise & Enhance:
Improve network performance, resilience and scalability across physical and virtual environments.
• Troubleshoot & Resolve:
Diagnose complex networking issues using packet capture, flow analysis and SDN monitoring tools.
• Collaborate & Innovate:
Work with multidisciplinary engineering teams to develop effective technical solutions and introduce improvements.
• Support & Improve:
Provide technical escalation support, contribute to root cause investigations and drive continuous service improvement.

Required qualifications to be successful in this role:

To thrive in this role, you’ll bring a passion for networking, a talent for solving challenges and experience working with technologies such as…