Infrastructure Engineer

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  (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

Exchange Online

Intune

Windows Server

Active Directory

Group Policy

Power Shell

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.