Senior Infrastructure Engineer

My Dublin based client is recruiting for a Senior Infrastructure Engineer to join the team on a permanent basis working on a hybrid model.

This is a hands-on infrastructure position suited to someone with a strong Microsoft background who is comfortable working across on-premise, cloud, and hybrid environments. You will provide senior-level technical support, manage core infrastructure services, and play an important role in maintaining the security, resilience, and performance of the organisation's technology estate.

Key Responsibilities

• Manage, maintain, and support Microsoft infrastructure across on-premise and cloud environments.
• Administer Windows Server, Active Directory, Group Policy, DNS, and DHCP.
• Manage the Microsoft 365 environment, including Exchange Online, SharePoint, Intune, and Entra ID (Azure AD).
• Administer and support Microsoft Azure, including hybrid infrastructure environments.
• Manage virtualised environments using VMware and/or Hyper-V.
• Support and troubleshoot networking technologies, including TCP/IP, VLANs, VPNs, routing, switching, DNS, and DHCP.
• Provide advanced L3 support, investigating and resolving complex infrastructure incidents and escalations.
• Implement and maintain infrastructure security controls, including MFA, Conditional Access, endpoint security, firewalls, VPNs, and vulnerability remediation.
• Manage and maintain backup, disaster recovery, and business continuity solutions and processes.
• Develop PowerShell scripts and automation to improve operational efficiency and reduce manual administration.
• Monitor infrastructure performance, availability, capacity, and security.
• Maintain accurate technical documentation, procedures, and infrastructure records.
• Work closely with internal stakeholders, third-party suppliers, and other technical teams on infrastructure projects and improvements.

Key Experience

The successful candidate will have:

• 5+ years' experience in a Senior Systems Administrator, Infrastructure Engineer, or similar infrastructure-focused position.
• Strong hands-on experience with Windows Server and Microsoft infrastructure technologies.
• Strong knowledge of Active Directory, Group Policy, DNS, and DHCP.
• Strong Microsoft 365 administration experience covering Exchange Online, SharePoint, Intune, and Entra ID.
• Strong Microsoft Azure administration experience, ideally within hybrid environments.
• Experience with VMware and/or Hyper-V virtualisation.
• Strong networking knowledge across TCP/IP, DNS, DHCP, VLANs, VPNs, routing, and switching.
• Experience managing enterprise infrastructure spanning on-premise and cloud environments.
• Strong understanding of infrastructure and security best practices, including MFA, Conditional Access, vulnerability remediation, endpoint security, firewalls, and VPNs.
• Practical experience with backup, disaster recovery, and business continuity.
• Hands-on PowerShell scripting and automation experience.
• Demonstrable experience handling complex L3 escalations and infrastructure troubleshooting.
• Strong technical documentation and stakeholder management skills.

Desirable Experience

The following would be advantageous:

• Relevant Microsoft Azure certifications.
• Experience with Docker and Kubernetes.
• Experience with infrastructure monitoring platforms such as SCOM, Nagios, Zabbix, Prometheus, or Azure Monitor.