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

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

Essential Skills & Experience

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

Desirable Skills

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