3rd Line Infrastructure Support Engineer

GCS Recruitment; United Kingdom; On-site; GBP 55,000 - 75,000; Full time

Job summary

GCS Recruitment are seeking a seasoned 3rd Line Infrastructure Engineer to join a client’s technical team in the UK. The role focuses on advanced technical support, incident escalation, and delivering solutions across a Microsoft-focused environment.

You will act as a senior escalation point for infrastructure incidents, ensuring stability, security, and continuous improvement of enterprise systems. The position involves supporting Microsoft 365, Intune, Active Directory, and Windows Server

Qualifications

• 3+ years in a 3rd line infrastructure or senior support role.
• Extensive knowledge of Microsoft technologies, including 365, Intune, AD, and Windows Server.
• Strong troubleshooting and analytical skills in enterprise IT.

Responsibilities

• Provide 3rd line support and escalation for complex infrastructure issues.
• Troubleshoot Microsoft technologies and manage Microsoft 365 environments.
• Support Active Directory, Intune, and Windows Server estates.
• Assist with infrastructure upgrades, migrations, and projects.

Skills

3rd Line Infra

Senior Support

Microsoft Tech

Troubleshooting

Tools

PowerShell

Job description

Job Title: 3rd Line Infrastructure Engineer

Role Overview

We are seeking an experienced 3rd Line Infrastructure Engineer to join our client's technical team. The successful candidate will provide advanced technical support, manage complex infrastructure issues, and deliver solutions across a Microsoft-focused environment.

You will act as a senior escalation point for infrastructure incidents, ensuring the stability, security, and continuous improvement of enterprise systems.

Key Responsibilities

• Provide 3rd line technical support and escalation for complex infrastructure issues.
• Troubleshoot and resolve advanced issues across Microsoft technologies.
• Manage and support Microsoft 365 (O365) environments, including user services, administration, and troubleshooting.
• Support and maintain Microsoft Intune for device management, configuration, and compliance.
• Administer and troubleshoot Active Directory services, including user accounts, group policies, permissions, and authentication issues.
• Support Windows server and enterprise infrastructure environments.
• Assist with infrastructure improvements, upgrades, migrations, and project-based work.
• Maintain security best practices and ensure systems meet business requirements.
• Create and maintain technical documentation and knowledge articles.

Essential Skills & Experience

• Strong experience working in a 3rd Line Infrastructure / Senior Support Engineer role.
• Extensive knowledge of Microsoft technologies, including:
  • Microsoft 365 / Office 365 administration
  • Microsoft Intune
  • Active Directory
  • Group Policy
  • Windows Server environments
• Strong troubleshooting and analytical skills.
• Experience supporting enterprise users and complex IT environments.
• Ability to manage incidents, problems, and changes effectively.

Desirable Skills

• Experience with Azure Active Directory / Microsoft Entra ID.
• Knowledge of PowerShell scripting and automation.
• Experience with endpoint security and device compliance solutions.
• Familiarity with ITIL processes and service management frameworks.