Systems Administrator – IT Infrastructure & Cloud

About the role

We are seeking a Systems Administrator to join a well‑established IT function supporting a dynamic professional services organisation in Dublin City Centre. You will be responsible for maintaining and enhancing core infrastructure, cloud platforms, networking, and security systems across the business.

Key responsibilities

• Administer Windows Server environments (2019+) on‑premise and in the cloud.
• Manage Active Directory, Azure AD, DNS, DHCP and Group Policy.
• Support Microsoft 365 services including Exchange Online, Intune, Teams, SharePoint and OneDrive.
• Maintain SQL Server platforms and related databases.
• Provide networking support – switching, routing, wireless and VPN solutions.
• Oversee cybersecurity tools, endpoint protection, patching and firewall technologies.
• Monitor infrastructure performance, handle upgrades, deployments and lifecycle management.
• Assist with security controls, audit remediation, access reviews and infrastructure hardening.

Required profile

• Proven experience with Windows Server 2019+ and hybrid cloud environments.
• Strong knowledge of AD/Azure AD, DNS, DHCP and Group Policy.
• Hands‑on experience with Microsoft 365 suite and Azure cloud services.
• Experience supporting SQL Server and enterprise networking.
• Familiarity with cybersecurity, endpoint protection and firewall management.
• Ability to troubleshoot complex infrastructure issues and manage competing priorities.

Required skills

• Windows Server 2019+
• Active Directory
• Azure Active Directory
• DNS
• DHCP
• Group Policy
• Microsoft 365
• Exchange Online
• Intune
• Teams
• SharePoint
• OneDrive
• SQL Server
• Enterprise networking (switching, routing, wireless)
• VPN technologies
• Firewall management
• Endpoint protection
• Patch management
• AV conferencing systems
• Azure cloud services