Network Engineer (DV Security Clearance)

Free-Work UK; Greater London; On-site; GBP 70,000 - 100,000; Full time

Benefits offered by this job

Competitive salary

Private healthcare

Pension

Share scheme (3.5% + 3.5% matching)

Job summary

CGI in London is seeking a Senior Network Engineer to own installation, configuration and ongoing optimisation of secure networking environments. You will apply networking, Linux, and cloud skills across Proxmox, AWS, Azure and GCP, with on-site presence five days a week.

You will influence infrastructure planning, script automation with Python/Bash/Ansible, and collaborate with CGI experts to deliver high-impact client environments.

Qualifications

• CCNA-level networking knowledge and fundamentals.
• Linux administration experience, ideally Red Hat.
• Experience with Python, Bash and Ansible.
• Experience with AWS, Azure and GCP cloud platforms.
• Juniper configuration/installation and Proxmox experience advantageous.
• Ability to own technical deliverables and collaborate across teams.

Responsibilities

• Build & Configure: Install and configure secure networking infrastructure across environments.
• Maintain & Optimise: Support reliable, secure, high-performing networks and infra.
• Automate & Improve: Use Python, Bash and Ansible to streamline operations.
• Administer & Support: Manage Linux-based systems and virtualization (Proxmox).
• Enable Cloud: Apply networking know-how across AWS, Azure and GCP.
• Troubleshoot & Resolve: Diagnose issues and implement effective solutions.
• Plan & Deliver: Build infra on- and off-site and assist procurement.
• Collaborate & Contribute: Work with CGI experts and stakeholders to deliver secure solutions.

Skills

CCNA level

Networking fundamentals

Network security

Linux administration

Python

Bash

Ansible

AWS

Azure

GCP

Proxmox

Juniper

Virtualisation

Tools

Proxmox

Job description

At CGI, you’ll help build and maintain secure, resilient infrastructure that enables critical programmes to succeed. As a Senior Network Engineer, you’ll take ownership of networking environments from installation and configuration through to ongoing optimisation, applying your expertise across Linux, automation and cloud technologies. You’ll have the freedom to solve complex infrastructure challenges creatively, contribute to both on-site and off-site builds, and help shape practical solutions that deliver lasting value. Working alongside a collaborative community of CGI experts, you’ll be supported in expanding your capabilities across networking, systems and cloud while making a tangible contribution to secure, high-impact client 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 the programme, you will need to hold UK Security Clearance or be eligible to go through this clearance. This is a role that requires you to be on site in London 5 days a week.

Candidate Profile

In this role, you will take ownership of installing, configuring and maintaining secure networking infrastructure and the environments that support it. You’ll apply your networking and systems expertise to build reliable infrastructure both on and off site, troubleshoot issues and identify opportunities to improve performance, resilience and security.

You’ll have scope to develop creative approaches to automation using Python, Bash and Ansible, while working across Linux systems and cloud platforms. Supported by CGI colleagues and working collaboratively with programme stakeholders, you’ll also contribute to infrastructure planning and procurement activities to help ensure the right solutions are delivered successfully.

• Build & Configure: Install and configure secure networking infrastructure across programme environments.
• Maintain & Optimise: Support reliable, secure and high-performing network and infrastructure environments.
• Automate & Improve: Use Python, Bash and Ansible to streamline infrastructure and operational activities.
• Administer & Support: Manage Linux-based systems and support virtualisation environments including Proxmox.
• Enable Cloud: Apply networking and infrastructure knowledge across AWS, Azure and GCP environments.
• Troubleshoot & Resolve: Diagnose infrastructure and networking issues and implement effective solutions.
• Plan & Deliver: Build infrastructure on and off site and contribute to associated procurement activities.
• Collaborate & Contribute: Work with CGI experts and programme stakeholders to deliver secure, effective solutions.

Required Qualifications To Be Successful In This Role

You’ll bring strong networking fundamentals at approximately CCNA level, combined with practical network security and infrastructure experience. You should be comfortable administering Linux environments, using scripting and automation technologies, and working with major cloud platforms. Experience with Juniper networking and Proxmox would strengthen your fit for the role.

• CCNA-level networking knowledge and strong networking fundamentals.
• Good understanding of network security principles and practices.
• Practical experience installing and configuring networking infrastructure.
• Strong Linux administration skills, ideally within Red Hat environments.
• Experience with Python, Bash and Ansible for scripting and automation.
• Working knowledge of AWS, Microsoft Azure and Google Cloud Platform (GCP).
• Experience building, maintaining and troubleshooting infrastructure environments.
• Experience with Juniper configuration and installation would be advantageous.
• Experience with Proxmox or comparable virtualisation technologies would be advantageous.
• Ability to work collaboratively while taking ownership of technical deliverables.