IT Infrastructure Specialist

You'll be joining a specialist security team that is a trusted partner to governments worldwide, protecting critical national infrastructure and committed to the safety and security of our nation and global communities. Our mission-focused work is innovative, inspiring and technologically challenging. We provide the opportunity to work on rare projects, with exciting tools and brilliant people. Everyone has access to unparalleled professional and personal development opportunities and your contribution is always valued. The role can be based near Hertford or Cheltenham, with a commute of 30-60 minutes. It is onsite (5 days office based), Monday‑Friday, 37.5 hours per week. You must be able to obtain DV clearance and have lived in the UK for 10+ years. Responsibilities Design, build, develop, integrate, test and maintain IT infrastructure to provide a robust customer on‑premise platform. Identify and implement design changes, improvements and updates required to keep products within supportability lifecycles. Utilise experience in physical and virtual host infrastructures to ensure a resilient platform for hosted applications. Produce high and low level design documentation and build guides. Execute against the project technical roadmap and delivery plan. Undertake self‑development to broaden knowledge in new technologies outside current skillsets. Qualifications & Experience Hands‑on experience in designing, building, developing, integrating, testing and maintaining IT infrastructure. Implementation of hardware and operating systems to hardened build standards, and use of vulnerability and compliance scanning tools. VMware infrastructure design, implementation and deployment skills. Advanced knowledge of Windows Server & Desktop, including specification, operating system builds, deployment toolsets (MDT, SCCM), OS version uplifts and migration. Experience with SAN storage solutions and networking. IP network design including Juniper and Cisco configuration. Experience with advanced Microsoft Active Directory, including Group Policy definition and deployment, OS and application integration. Integration with monitoring, patch update and anti‑virus systems. PKI infrastructure design, build and deployment. MS SQL database skills, including design, deployment, high availability and version migration. Ability to perform SAN storage implementation, configuration and systems upgrade. Experience building and deploying network and infrastructure management and monitoring tools with strong knowledge of SNMP, syslog & IP networking, and OS and network troubleshooting skills. Benefits Competitive salary. 10% on‑target bonus (depending on country). BT pension scheme: minimum 5% employee contribution, BT contribution 10%. On‑call allowance (depending on role requirements). 25 days annual leave (excluding bank holidays), increasing with service. Flexible benefits including cycle‑to‑work, healthcare, season ticket loan. World‑class training and development opportunities. Equal family leave: 18 weeks full pay, 8 weeks half pay, 26 weeks statutory (for all parents). Enhanced women's health support. 24/7 private virtual GP appointments for UK colleagues. 2 weeks paid carer's leave. Option to join BT Shares Saving scheme. Discounted broadband, mobile and TV packages. Access to numerous retail discounts, including BT shop. Due to the sensitive nature of this role, you will be required to undergo DV (Developed Vetting) level Security Clearance. An allowance of £5,000 per annum may be payable monthly while you hold this clearance. #J-18808-Ljbffr