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) which makes you a member 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. This role offers an exciting opportunity to engage with groundbreaking technologies in a dynamic and rewarding environment. At CGI, we are deeply committed to the growth and development of our team members, offering extensive learning opportunities to help you stay at the forefront of an ever-evolving technology landscape. Our culture values innovation, collaboration, and ownership, making it an ideal environment for self-motivated individuals to thrive. Our roles are only available 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. Any individual without security clearance is welcome to apply and will always be considered for this or wider opportunities in CGI, where appropriate. This role will require you to work on site in London 5x per week. Candidate profile: -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 – Assisting 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 to be successful in this role 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. #LI-JS2