Infrastructure Engineer / Specialist

3rd Line Infrastructure & Network Engineer

About the Role

An experienced and highly capable 3rd Line Infrastructure & Network Engineer is sought to join a growing IT team, providing expert technical support and infrastructure leadership across a complex enterprise environment.

The successful candidate will possess outstanding hands-on experience across the Microsoft technology stack, combined with strong networking expertise and a solid understanding of SharePoint administration and support. This is a senior technical role requiring excellent troubleshooting skills, a proactive mindset, and the ability to take ownership of critical infrastructure services.

Key Responsibilities

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• Provide 3rd line support for business-critical infrastructure, systems, and network services.
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• Design, implement, maintain, and optimise Microsoft-based environments.
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• Administer and support Microsoft 365 services, including Exchange Online, Entra ID (Azure AD), Teams, Intune, and SharePoint.
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• Manage and support Windows Server environments, Active Directory, Group Policy, DNS, DHCP, and virtualisation platforms.
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• Monitor, troubleshoot, and resolve complex network issues across LAN, WAN, Wi-Fi, VPN, and firewall technologies.
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• Lead technical investigations, root cause analysis, and problem management activities.
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• Support infrastructure upgrades, migrations, and transformation projects.
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• Maintain security best practices and support compliance requirements.
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• Produce and maintain technical documentation, procedures, and knowledge articles.
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• Collaborate with internal teams, third-party vendors, and stakeholders to deliver high-quality IT services.
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Essential Skills & Experience

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• Proven experience in a 3rd Line Infrastructure Engineer, Senior Infrastructure Engineer, or similar role.
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• Strong hands-on expertise across the Microsoft ecosystem, including:
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• Microsoft 365
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• Azure / Entra ID
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• Exchange Online
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• Intune
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• Windows Server
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• Active Directory
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• Group Policy
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• PowerShell
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• Strong networking knowledge and troubleshooting experience, including:
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• TCP/IP
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• Routing and Switching
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• VLANs
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• Firewalls
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• VPNs
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• Network Security
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• Wireless Networking
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• Experience supporting and administering SharePoint Online.
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• Experience with virtualisation technologies such as VMware or Hyper-V.
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• Strong understanding of cybersecurity principles and infrastructure best practices.
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• Excellent problem-solving and analytical skills.
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• Ability to work independently and manage competing priorities.
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Desirable Skills

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• Microsoft certifications (Azure, Microsoft 365, Security, or Infrastructure related).
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• Experience with cloud migration projects.
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• Experience with backup and disaster recovery solutions.
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• Knowledge of modern security frameworks and monitoring tools.
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• Exposure to automation and scripting technologies.
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