Active Directory Specialist

We are seeking an experienced Active Directory SME / Infrastructure Engineer to join a leading enterprise environment. This role requires deep expertise across Windows Server, Active Directory, Azure Entra ID, and virtualisation platforms such as VMware and Hyper-V.

You will be responsible for maintaining the stability, security, and performance of critical infrastructure systems, working closely with internal teams and external vendors to ensure seamless operations across a complex IT landscape., Windows Server Administration

• Troubleshoot OS-related issues, including unexpected restarts, performance degradation, and system bottlenecks
• Manage user access and permissions
• Oversee server commissioning and decommissioning
• Perform patching and vulnerability remediation
• Execute backup and restoration activities using approved tools
• Ensure high availability and operational stability of Windows environments

Active Directory & Azure Entra ID

• Administer Active Directory (users, groups, and organisational units)
• Configure and maintain Group Policy Objects (GPOs)
• Manage DNS records, troubleshooting, and maintenance
• Administer DHCP scopes, reservations, and configurations
• Manage FTP services on Windows platforms
• Oversee SSL certificate lifecycle management (issuance, renewal, revocation)
• Deploy and manage Azure services, including Logic Apps and related components

Virtualisation (VMware / Hyper-V)

• Maintain and monitor virtual infrastructure health
• Create and configure virtual machines, including optimisation of resources
• Manage snapshots, load balancing, and troubleshooting
• Conduct performance assessments and environment health checks
• Configure and manage HA/DRS clusters for resilience and failover
• Administer virtual networking, storage, and data stores
• Install and onboard ESXi/ESX hosts
• Support Hyper-V environments where applicable

Vendor Management

• Act as the primary liaison for Microsoft, VMware, and other vendors
• Coordinate incident resolution, escalations, and support requests
• Ensure timely communication and resolution of infrastructure issues

• 8+ years' experience in infrastructure engineering or a similar role
• Strong expertise in Windows Server administration
• Extensive experience with Active Directory and Azure Entra ID
• Proven experience managing VMware or Hyper-V environments
• Strong knowledge of DNS, DHCP, and core networking principles
• Experience with patch management, vulnerability remediation, and backup/restore processes
• Hands-on experience with SSL certificate management
• Excellent troubleshooting and problem-solving skills
• Ability to work effectively in fast-paced, enterprise environments
• Strong communication skills with experience working across technical teams and vendors

Desirable Skills & Experience

• Experience administering FTP services on Windows
• Knowledge of Azure services and cloud-based infrastructure
• Understanding of enterprise security best practices
• Familiarity with large-scale, highly regulated environments (e.g. utilities, finance)