Are you an Infrastructure Engineer ready for your next challenge? Sopra Steria is delivering a unique solution from the ground up for the Defence sector, integrating infrastructure and applications within highly secure, mission-critical environments. This is an opportunity to make a genuine impact, contribute to complex technical solutions, and work on a nationally significant programme that few organisations can offer exposure to. We are looking for a Lead Infrastructure Engineer to oversee the day-to-day technical operations of the Windows Team, reporting to the Head of Operating Systems. This is a key leadership role with direct influence on operational performance, service quality and profitability. You will provide both technical expertise and people leadership, helping to shape the team's capability while ensuring the successful delivery of infrastructure services and project outcomes. For someone motivated by purpose, scale, and technical complexity, this role offers the chance to see their work directly contribute to outcomes that really matter. This role requires full-time, on-site working in Hertfordshire. Ideally, you will hold active MoD DV clearance; however, we will also consider candidates who hold active SC clearance and are willing to undergo DV clearance. What you will be doing: Lead, manage and mentor the Windows Team, developing individual capability and building a strong SME structure. Support project delivery, including solution design, estimation, detailed design and implementation activities. Ensure services are delivered in line with agreed SLAs, including resolving or escalating issues where appropriate. Produce and maintain operational and user documentation to ensure standards and consistency are met. Work with Architects, Solution Designers and Project Managers to validate solutions, provide recommendations and report progress. Contribute to pre-sales activity and ensure all team outputs are fully documented in line with governance standards. What you will bring: Expert knowledge of Windows and infrastructure technologies, including current best practice and future developments. Strong enterprise infrastructure experience, including administration, fault finding, diagnosis and resolution. Technical knowledge across key infrastructure areas such as file and print, thin client environments, messaging, virtualisation and hardware. Proven experience of leading infrastructure projects using recognised project management methodologies such as PRINCE2 or PMI. Experience of working to demanding SLAs within a strong governance and compliance framework. Extensive infrastructure management experience, supported by a Diploma in Computer Science or equivalent relevant experience. 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, Permanent Location: Hertfordshire - full time on site Security Clearance Level: MoD DV Internal Recruiter: Josh Salary: Up to £70k Benefits: £5,400 car allowance, 3% cash fund, 25 days annual leave with the option to buy additional days, health cash plan, life assurance, pension Loved 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. We embrace difference as a source of creativity, innovation and competitive advantage and are striving to become a more diverse organisation. We welcome applications from people with a diverse variety of backgrounds and identities. We are committed to equality of opportunity for all and do not discriminate on the basis of race, religion, colour, gender, age, disability, sexual orientation or marital status. We have partnered with Vercida, the UK's largest diversity and inclusion focused careers site, where all our vacancies are available in an accessible format. If you require any adjustments to the recruitment process, to enable you to perform to the best of your ability, please let us know when completing your application. We participate in the Disability Confident scheme and are committed to offering an interview to any candidate with a disability, who meets the minimum criteria for the role. If you believe this could apply to you, please let us know when completing your application.