Senior 3rd-Line Engineer - M365/Azure | Hybrid MSP

McGregor Boyall; Greater London; Hybrid; GBP 65,000 - 85,000; Full time

Job summary

McGregor Boyall is seeking an experienced 3rd Line Engineer specializing in M365 and MSP environments, with a hybrid role in Greater London. You will act as the senior escalation point for complex issues and lead major incident investigations across a diverse client base.

This position combines technical troubleshooting with proactive service improvement, customer engagement, and mentoring of junior engineers to optimise Microsoft cloud and infrastructure environments.

Qualifications

• Must have proven experience as a 3rd Line or Senior Infrastructure Engineer.
• Strong Microsoft 365 knowledge across Exchange Online, Teams, SharePoint, Entra ID and Intune.
• Experience supporting Azure, Windows Server and Active Directory environments.
• Solid networking understanding: DNS, DHCP, TCP/IP and VPNs.
• Good grasp of endpoint management and IT security best practices.
• Experience in ITIL-led service environments and ITSM platforms.
• Excellent troubleshooting, analytical and communication skills.

Responsibilities

• Act as final escalation point for complex incidents and service requests.
• Lead major incident investigations and root cause analysis.
• Deliver audits, health checks and best-practice assessments.
• Support and maintain M365, Azure, Windows Server and AD.
• Identify risks and propose resilience, security and performance improvements.
• Produce technical documentation and customer-facing reports.
• Mentor 1st and 2nd Line Engineers.
• Support service-improvement initiatives and knowledge sharing.

Skills

Microsoft 365

Exchange Online

Teams

SharePoint

Entra ID

Intune

Azure

Windows Server

Active Directory

Networking fundamentals

VPN technologies

Endpoint management

IT security

ITIL/ITSM

Troubleshooting

Communication

Job description

McGregor Boyall is seeking an experienced 3rd Line Engineer specializing in M365 and MSP environments, with a hybrid role in Greater London. You will act as the senior escalation point for complex issues and lead major incident investigations across a diverse client base.

This position combines technical troubleshooting with proactive service improvement, customer engagement, and mentoring of junior engineers to optimise Microsoft cloud and infrastructure environments.