Position Description
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.
CGI’s Space, Defence and Intelligence business unit focuses primarily on the delivery of contemporary and innovative technical solutions for the government agencies’ most challenging problems. We work, build, and operate bespoke, technically complex, mission‑critical systems which help our clients keep us all safe and secure. We are currently looking for an experienced System engineer to join our cross‑functional team who, in partnership with our clients, will help define, guide and assure the delivery of integrated solutions. The role offers fantastic opportunities to work within an interesting and highly rewarding environment. We are heavily committed to developing our members and provide excellent learning and development opportunities to ensure that your knowledge and skills keep pace with the evolving technology landscape. We engender a culture of innovation, collaboration and ownership; highly motivated self‑starters thrive within our organisation. Although we would like candidates to have all the skills we need, we would consider high quality individuals who meet most of the criteria.
Due to the secure nature of this project, this role requires candidates to either already hold, or be eligible to obtain, a high level of UK Security Clearance. To meet the eligibility criteria for this clearance, applicants must be sole British nationals, have been resident in the UK for the past 10 years, and must not have spent more than 28 consecutive days outside the UK within the last five years. Individuals who do not currently hold clearance are still encouraged to apply and will be considered both for this position and for other suitable opportunities within CGI where appropriate.
This role is primarily based on a secure client site and requires attendance on site five days per week due to the sensitive nature of the work and the systems involved. While the position is predominantly site‑based, there may be occasional flexibility where business needs and security constraints allow. Any such arrangements would be agreed in advance with the project team.
Duties and Responsibilities
* Support and enhance secure Linux environments across production and non‑production systems, ensuring reliability, performance, and security.
* Diagnose and resolve system issues across production and non‑production Linux environments.
* Administer and maintain enterprise Linux systems, ensuring stability and performance.
* Optimize and automate deployments to improve efficiency and reliability.
* Support and enable cloud adoption, hybrid architectures, and migration activities.
* Contribute and implement security improvements, including zero‑trust approaches.
* Collaborate and advise clients and internal teams on best practices and improvements.
Required Qualifications
* At least 2 years’ experience as a Linux Systems Administrator.
* Strong hands‑on expertise with enterprise Linux distributions (Red Hat, CentOS, Ubuntu).
* Proficiency with Linux command‑line tools and shell scripting.
* Experience with system monitoring, patching, performance tuning, and automation.
* Proven ability to troubleshoot issues and perform root‑cause analysis.
* Working knowledge of networking concepts in Linux environments.
* Experience with security hardening and secure system configurations.
* Exposure to cloud, virtualised infrastructure, or infrastructure‑as‑code tools is advantageous.
* DV Security Clearance (or willingness and eligibility to obtain) and sole UK nationality.
Additional Skills and Traits
You will have hands‑on experience administering Linux systems in secure environments, with a proactive mindset and strong troubleshooting skills. You are comfortable working closely with clients, contributing to modernisation initiatives, and continuously developing your technical capability.
Benefits
Life at CGI is rooted in ownership, teamwork, respect and belonging. You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.
Your work creates value. You’ll 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.
You’ll shape your career by joining a company built to grow and last. You’ll 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.
Together, as owners, let’s turn meaningful insights into action.
Location & Application Notes
London, England, United Kingdom
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