Salary: £35,000 - 75,000 per year Requirements: 5 years supporting hybrid AD (On Prem & Azure AD) in enterprise environments. Deep knowledge of Group Policy (including AGPM), ADFS, AD Connect, and LDAP. Strong grasp of Azure AD security (RBAC, Conditional Access, MFA, PIM). Proficiency across Windows Server 2016/2019/2022 (legacy familiarity from 2003 is beneficial), DNS/DHCP, DFS, clustering, and Windows PKI. Operational excellence with Domain Controllers and FSMO role management. Azure PowerShell scripting for automation and support. Experience with O365/Exchange Online and Endpoint Management in identity related contexts. Strong documentation and communication skills; confident working directly with senior customer stakeholders. Familiarity with ServiceNow (Incidents, Requests, Change, Reporting). Responsibilities: Administer and maintain hybrid identity infrastructures across on-prem Active Directory and Azure Active Directory (Entra ID), ensuring secure, reliable authentication and directory services. Troubleshoot and optimise identity platforms including AD, ADFS, Azure AD Connect/Sync, Entra ID, and LDAP, resolving complex federation, synchronisation, and authentication issues. Lead Group Policy lifecycle management, including design, implementation, and controlled deployment using AGPM to ensure consistent and secure configuration baselines. Manage core AD infrastructure components such as Domain Controllers, FSMO roles, DNS, DHCP, Sites & Services, ensuring resilience, correct topology, and high availability. Implement and enforce Azure AD security controls, including RBAC, Conditional Access, MFA, Identity Protection, PIM, and other Zero Trust aligned safeguards. Support Azure-based platforms including Azure Virtual Desktop, Azure Storage, and policy-driven automation using PowerShell to streamline operational tasks. Administer and support Windows Server environments (2016 through 2025), ensuring proper patching, performance, and service reliability. Manage Public Key Infrastructure (PKI) and certificate-based authentication, including lifecycle operations, template management, and secure issuance practices. Support and maintain Virtualisation Platforms in conjunction with Active Directory and domain architecture best practices. Contribute to the design and delivery of identity and infrastructure solutions, including installation, configuration, optimisation, and continuous service improvement initiatives. Produce comprehensive technical documentation, including HLDs, LLDs, operational guides, runbooks, and service model documentation for internal and customer use. Work within Agile and ITIL-aligned processes to drive continuous improvement, operational consistency, and service excellence. Deliver clear communication and exceptional customer service, supporting both technical and non-technical stakeholders in resolving identity and access-related issues. Configure and support enterprise integrations, including Azure Enterprise Applications, ADFS-integrated services, Single Sign-On (SSO), and user/application provisioning for SaaS and PaaS platforms. Technologies: Active Directory Azure Support ITIL LDAP PaaS PowerShell RBAC Security ServiceNow Windows Office 365 Cloud ARM CI/CD DevOps Kubernetes More: We are looking for an Active Directory Support Specialist to join our team on-site at Client Site Aldermaston, where you will play a crucial role in supporting, maintaining, and enhancing our hybrid identity services environment. This position involves delivering expert technical support within a high-security public-sector setting while contributing to long-term service transformation and operational automation initiatives. We value a strong customer-focused mindset, the ability to work independently, and a commitment to maintaining security standards. In return, we offer a collaborative working environment where your expertise will drive the evolution of our identity management systems. last updated 23 week of 2026