Linux Administrator (DV Security Clearance)

CGI; City Of London; On-site; GBP 40,000 - 60,000; Full time

Job summary

A technology and consulting firm in the UK is looking for a Linux Administrator to join their Secure Innovation & Advisory team. The role requires a minimum of 2 years of experience in Linux systems administration, strong command-line utility skills, and knowledge of networking concepts. This position is on-site in London and offers great benefits, including a competitive salary, pension, and healthcare.

Benefits

Competitive salary

Excellent pension

Private healthcare

Share scheme

Qualifications

• Minimum 2 years of hands-on experience as a Linux Systems Administrator.
• Strong knowledge of managing and maintaining enterprise-grade Linux environments.
• Experience with performance tuning and system monitoring.

Responsibilities

• Diagnosing problems with the system in production and non-prod.
• Increase the efficiency of system deployments.
• Assist the client in their Journey to the Cloud.

Skills

Linux command-line utilities

Shell scripting (Bash)

System administration tasks

Troubleshooting system issues

Networking concepts (TCP/IP, DNS)

Security hardening

Cloud environments (AWS, Azure)

Tools

Ansible

Terraform

VMware

Job description

Overview

Linux Administrator (DV Security Clearance)

CGI's Space, Defence, and Intelligence business unit is dedicated to delivering cutting-edge technical solutions that address the most complex challenges faced by government agencies. Our mission-critical systems are custom-built to ensure security, reliability, and innovation, helping our clients protect the nation and its people. We are currently seeking a Linux Admin to join our Secure Innovation & Advisory team, working collaboratively with clients to deliver impactful solutions. CGI was recognised in the Sunday Times Best Places to Work List 2025 and has been named one of the World's Best Employers by Forbes magazine. We offer a competitive salary, excellent pension, private healthcare, plus a share scheme (3.5% + 3.5% matching). We are committed to inclusivity and support of the Armed Forces, and hold a Gold Award in recognition of our Armed Forces Corporate Covenant. Join us and you'll be part of an open, friendly community of experts with opportunities for training and career growth.

This role offers an exciting opportunity to engage with groundbreaking technologies in a dynamic and rewarding environment. CGI emphasizes growth and development with extensive learning opportunities to stay at the forefront of evolving technology. Our culture values innovation, collaboration, and ownership, creating an ideal environment for self-motivated individuals.

Our roles are available only if you hold a UK Security Clearance and are a sole UK National due to the secure nature of the project. You will either hold a higher level clearance or be willing to obtain it. Individuals without security clearance are welcome to apply and will be considered for this or wider opportunities where appropriate.

This role will require you to work on site in London 5x per week.

Responsibilities

• Diagnosing and solutioning problems with the system in production and non-prod
• Increase the efficiency of system deployments, freeing up more time for development opportunities
• Assist the client in their Journey to the Cloud, understanding hybrid cloud and migration strategies
• Facilitate the journey from isolated and zone-based networks to Zero Trust Implementation

Required qualifications

• Minimum 2 years of hands-on experience as a Linux Systems Administrator, with proven expertise in managing and maintaining enterprise-grade Linux environments (e.g., Red Hat, CentOS, Ubuntu).
• Strong knowledge of Linux command-line utilities, shell scripting (Bash, etc.), and system administration tasks including user and group management, file system permissions, software installations, and service configurations.
• Experience in configuring and maintaining Linux servers, including performance tuning, system monitoring, patch management, and automation of routine tasks.
• Familiarity with troubleshooting system issues, analysing logs, and performing root cause analysis for outages or performance degradation.
• Working knowledge of networking concepts (e.g., TCP/IP, DNS, firewalls) in a Linux environment.
• Experience with security hardening, user authentication, and compliance configurations for secure systems operation.
• Exposure to cloud environments (e.g., AWS, Azure, GCP) or virtualised infrastructure (e.g., VMware, KVM) in a Linux context is advantageous.
• Familiarity with infrastructure as code tools (e.g., Ansible, Terraform) or configuration management platforms is a plus.