Are you an Infrastructure Engineer who enjoys working on complex, secure technology environments where your work genuinely matters?We are supporting a major Defence programme, building and maintaining mission-critical infrastructure that underpins secure services across the Defence landscape. This is not a routine support role. You will be working in a highly secure environment, solving technical challenges, supporting critical systems, and contributing to a programme with real national importance.We are looking for experienced Infrastructure Engineers with strong Wintel and VMware skills, ideally gained within Defence, MoD, government, or similarly secure and regulated environments.This role would suit someone who enjoys hands-on engineering, problem-solving, and working closely with technical teams to deliver reliable, secure infrastructure services.This role is full time on site in the Hertfordshire area.What you will be doing:Build, configure, support, and maintain secure infrastructure across Wintel and VMware environments.Troubleshoot incidents and technical issues across servers, virtualisation, storage, and associated infrastructure services.Support infrastructure upgrades, patching, deployments, and service improvements.Work closely with architecture, networks, security, and application teams to deliver joined-up technical solutions.Maintain clear technical documentation, operational procedures, and configuration records.Ensure infrastructure services meet security, availability, and operational requirements within a Defence environment.What you will bring:Strong experience in Wintel infrastructure engineering and support.Experience working with VMware technologies in enterprise environments.Good understanding of Windows Server, Active Directory, Group Policy, DNS, DHCP, and core infrastructure services.Experience supporting secure, complex, or regulated environments, ideally Defence or MoD.Strong troubleshooting skills and the ability to work across technical teams.It would be great if you had:Experience with automation, monitoring, backup, or storage technologies.Experience working on large-scale transformation, migration, or greenfield infrastructure programmes.If you are interested in this role but not sure if your skills and experience are exactly what we're looking for, please do apply, we'd love to hear from you!Employment Type: Full-time, PermanentLocation: Hertfordshire - full time on siteSecurity Clearance Level: Eligible for Developed Vetting (DV)Internal Recruiter: JoshSalary: Competitive, based on experienceBenefits: 25 days annual leave with the option to buy additional days, health cash plan, life assurance, pensionLoved reading about this job and want to know more about us?Sopra Steria's Aerospace, Defence and Security business designs, develops and deploys digital solutions to Central Government clients. The work we do makes a real difference to the client's goal of National Security, and we operate in a unique and privileged environment. We are given time for professional development activities, and we coach and mentor our colleagues, sharing knowledge and learning from each other. We foster a culture in which employees feel valued and supported and have pride in their work for the customer, delivering outstanding rates of customer satisfaction in the UK's most complex safety- and security-critical markets.