Senior Infrastructure Engineer

You will support the design, build, configuration, and testing of critical infrastructure components, ensuring they meet operational and security requirements. Your expertise will help deliver a robust environment that supports both cloud-hosted applications and the wider user infrastructure, including servers, desktops, and local area networks. You will work closely with architects, project teams, clients, and technology partners to develop and implement infrastructure solutions aligned to business and technical objectives. Taking ownership of infrastructure design and operational readiness, you will contribute to strategic decisions while helping to maintain high standards of security, documentation, and service delivery. Key responsibilities: *Design & Deliver secure on-premises infrastructure solutions *Build & Configure servers, desktops, virtualisation platforms, and supporting services *Test & Validate infrastructure components against operational requirements *Harden & Secure environments to meet stringent security standards *Administer & Optimise Microsoft-based infrastructure technologies *Collaborate & Advise project teams, architects, vendors, and stakeholders *Create & Maintain technical documentation, standards, and templates *Support & Improve production, development, and test environments *Contribute & Influence infrastructure strategy and technology roadmaps *Troubleshoot & Resolve complex infrastructure issues Required qualifications to be successful in this roleTo succeed in this role, you will bring extensive infrastructure engineering experience gained within secure or highly regulated environments. You will possess strong Microsoft platform expertise, a proactive approach to problem solving, and the ability to design, implement, and support enterprise-scale infrastructure solutions. Experience working within defence or government environments would be highly advantageous.

*You should have 10+ years' experience in Wintel infrastructure engineering *Strong expertise in Active Directory and Group Policy administration *Proven experience administering Microsoft Hyper-V environments *Strong PowerShell scripting and automation skills *Experience implementing and supporting PKI solutions *Proven ability to design, build, and secure enterprise infrastructure *Experience working within highly secure or classified environments *Strong understanding of infrastructure security hardening principles *Excellent troubleshooting, documentation, and stakeholder engagement skills Desirable qualifications and experience: *Experience with Linux administration *Azure Stack Hub experience *Network design and implementation experience *Previous MOD or wider Defence sector experience *Understanding of hybrid cloud and on-premises cloud environments #LI-RB8 Together, as owners, let's turn meaningful insights into action.

This job is with CGI, an inclusive employer and a member of myGwork - the largest global platform for the LGBTQ+ business community. Please do not contact the recruiter directly. Senior Infrastructure Engineer Position DescriptionCGI is helping shape the future of secure defence technology through the delivery of innovative, mission-critical infrastructure solutions. As an Infrastructure Engineer, you will play a key role in supporting the deployment of 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 have the opportunity to take ownership of complex infrastructure challenges, contribute to meaningful outcomes, and support the successful delivery of a strategically important programme. 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., 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. Come join our team-one of the largest IT and business consulting services firms in the world.