Senior Infrastructure Engineer

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 hybrid position with ad hoc travel to sites near Lincoln and Leatherhead.

Your future duties and responsibilities You will join a small, highly skilled team of Infrastructure and DevOps Engineers responsible for maintaining a secure private cloud platform and its supporting infrastructure. As a senior member of the team, you will take ownership of technical delivery across project and operational activities, ensuring the platform remains secure, resilient and fit for mission-critical defence workloads. This role offers the opportunity to influence technical decisions, collaborate with architects and stakeholders, and contribute to the evolution of a strategically important capability.

The environment is predominantly Microsoft-based, with a growing Red Hat/Rocky Linux estate, running on Azure Stack Hub private cloud. You will apply your expertise across Windows Server, Active Directory, Group Policy, virtualisation and infrastructure automation while helping to strengthen security, improve operational efficiency and support continuous platform enhancements.

Key responsibilities:

• Design & deliver secure on-premises infrastructure solutions

• Build & Configure Windows servers, desktops, Hyper-V virtualisation and supporting infrastructure services

• Administer & Optimise Active Directory, Group Policy and Microsoft infrastructure technologies

• Automate & improve operational processes using PowerShell, Ansible, Terraform or similar tools

• Implement & Support PKI services and infrastructure security controls

• Harden & Secure environments in line with defence security standards

• Test & Validate infrastructure components against operational and technical requirements

• Collaborate & Advise architects, project teams, vendors and key stakeholders

• Create & Maintain technical documentation, standards and implementation guides

• Troubleshoot & Resolve complex infrastructure and platform issues

• Contribute & Influence infrastructure strategy, platform improvements and technology roadmaps

To succeed in this role, you will have strong experience delivering and supporting enterprise Wintel infrastructure within secure or complex environments. You will be confident working across Microsoft technologies, infrastructure automation and security hardening, while demonstrating a proactive approach to technical ownership, problem solving and collaboration. Experience within Defence or other highly regulated environments would be advantageous., * Extensive experience in Wintel infrastructure engineering

• Strong expertise administering Active Directory and Group Policy

• Proven experience managing Microsoft Hyper-V environments

• Experience with PowerShell scripting and/or infrastructure automation using Ansible or Terraform

• Experience implementing and supporting Public Key Infrastructure (PKI)

• Strong understanding of infrastructure security hardening principles

• Excellent troubleshooting, documentation and stakeholder engagement skills, * Experience administering Linux environments (Red Hat and/or Rocky Linux)

• Azure Stack Hub (Private Cloud) experience

• Network design and WAN infrastructure experience

• Previous experience within the Defence sector

• Understanding of hybrid cloud and on-premises cloud environments

Together, as owners, let's turn meaningful insights into action.

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.

CGI is helping shape the future of secure defence technology by delivering innovative, mission-critical infrastructure solutions that support the UK's most important programmes. As an Infrastructure Engineer within our Space, Defence and Intelligence business, you will play a key role in deploying and supporting a new on-premises cloud platform for the MOD, helping to deliver resilient, secure and high-performing environments that enable operational success. Working alongside experienced technical specialists, you will take ownership of complex infrastructure challenges, contribute to meaningful outcomes, and develop your expertise on a strategically significant programme where your work makes a real difference., Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you'll reach your full potential because 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. That same commitment to fairness extends to how we use technology. To support our recruitment team, AI tools may be used to help assess applications though they never replace human judgement. All hiring decisions remain entirely in the hands of our recruitment professionals. Come join our team-one of the largest IT and business consulting services firms in the world.