Senior Infrastructure Engineer

Fruition Group Ireland; Dublin; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Fruition Group Ireland seeks a Senior Infrastructure Engineer in Dublin on a permanent, hybrid basis. The role spans on‑premise, cloud, and hybrid environments with a strong Microsoft focus.

You will manage core infrastructure services, secure and optimize the technology estate, and provide senior-level support across Windows Server, Active Directory, AD, and Microsoft 365. The position emphasizes automation through PowerShell and collaboration with various teams.

Qualifications

• 5+ years in a Senior Systems Administrator/Infrastructure Engineer role.
• Hands-on with Windows Server and Microsoft infrastructure technologies.
• Strong AD, GPO, DNS, DHCP knowledge.
• Strong Microsoft 365 administration: Exchange Online, SharePoint, Intune, Entra ID.
• Strong Azure administration in hybrid environments.
• Experience with VMware and/or Hyper‑V virtualization.
• Strong networking knowledge: TCP/IP, DNS, DHCP, VLANs, VPNs, routing, switching.
• Infrastructure and security best practices: MFA, Conditional Access, vulnerability remediation, endpoint security, firewalls, VPNs.
• Backup, disaster recovery, and business continuity experience.
• PowerShell scripting and automation experience.
• Experience handling complex L3 escalations and troubleshooting.
• Strong documentation and stakeholder management.

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 (Exchange Online, SharePoint, Intune, Entra ID).
• Administer Microsoft Azure, including hybrid infrastructure environments.
• Manage virtualised environments using VMware and/or Hyper-V.
• Support and troubleshoot networking technologies (TCP/IP, VLANs, VPNs, routing, switching).
• Provide advanced L3 support, resolving complex infrastructure incidents.
• Implement and maintain infrastructure security controls (MFA, Conditional Access, endpoint security, firewalls, VPNs, vulnerability remediation).
• Manage backup, disaster recovery, and business continuity solutions and processes.
• Develop PowerShell scripts and automation to improve efficiency.
• Monitor infrastructure performance, availability, capacity, and security.
• Maintain technical documentation and infrastructure records.
• Collaborate with stakeholders, third-party vendors and other teams on projects.

Skills

5+ years experience

Windows Server

Active Directory

Group Policy

DNS

DHCP

Microsoft 365 administration

Exchange Online

SharePoint

Intune

Entra ID (Azure AD)

Azure administration

VMware/Hyper-V

Networking TCP/IP/VLANs/VPN

PowerShell scripting

L3 incident troubleshooting

Tools

Docker

Kubernetes

SCOM

Nagios

Zabbix

Prometheus

Azure Monitor

Job description

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.

The following would be advantageous:

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