Senior 3rd‑Line IT Infrastructure Engineer – Azure & M365

Apogee Corporation; England; Hybrid; GBP 55,000 - 75,000; Full time

Job summary

Apogee Corporation in the United Kingdom is seeking a skilled 3rd Line Support Technician to act as the final escalation point for complex incidents and to own infrastructure stability across server, cloud, and network environments.

You will lead changes, onboard new customers, and raise standards through documentation and knowledge sharing within the wider support teams. A focus on security and enterprise-scale delivery is essential.

Qualifications

• Senior 3rd Line engineer with deep Microsoft/infrastructure experience.
• Experience in enterprise or public sector environments.
• Ability to provide escalation support and technical leadership.

Responsibilities

• Act as final escalation point for complex technical issues.
• Maintain and improve customer IT infrastructure, patches and upgrades.
• Design, implement, and support solutions across server, cloud and network.
• Contribute to infrastructure change, system improvements, and deployments.
• Support client onboarding and produce high-quality technical documentation.
• Provide guidance to 1st and 2nd line teams and work in change control processes.
• Support customers via phone, email and self-service portals.
• Participate in an on-call rota (up to one week in every four).
• Develop technically through training and certifications.

Skills

Microsoft 365

Azure

SCCM

Intune

Defender

Windows Server

Active Directory

Group Policy

DNS/DHCP

RDS

Hybrid AD

Virtualization

Networking basics

IT security

Job description

Apogee Corporation in the United Kingdom is seeking a skilled 3rd Line Support Technician to act as the final escalation point for complex incidents and to own infrastructure stability across server, cloud, and network environments.

You will lead changes, onboard new customers, and raise standards through documentation and knowledge sharing within the wider support teams. A focus on security and enterprise-scale delivery is essential.