3rd Line Support Engineer

This 3rd Line Support Engineer role places you onsite with a high-profile infrastructure client in London, acting as the highest technical escalation point. You’ll work hands-on with complex technical issues while also contributing to project work, service improvement initiatives, and the development of junior engineers.

You’ll gain exposure to large-scale, enterprise environments, have genuine technical ownership, and be part of a team that values quality delivery, progression, and professional development.

What You’ll Be Doing

• Acting as the senior onsite escalation point for complex technical incidents
• Owning investigation, diagnosis, and resolution of 3rd line issues
• Supporting and managing internal infrastructure alongside ad-hoc project work
• Providing technical leadership through mentoring and guidance of junior engineers
• Managing client expectations through clear, professional communication
• Ensuring incidents, changes, and time entries are accurately logged
• Maintaining and updating technical documentation as environments evolve
• Working closely with the Service Delivery Manager to align on service standards
• Supporting continuous service improvement and wider team objectives

• Proven experience working onsite at a client premises in a senior support capacity
• Strong hands-on experience with Microsoft Exchange and Microsoft 365
• Advanced networking knowledge (TCP/IP, routing, switching, NGFWs)
• VPN experience (site-to-site and remote access)
• Virtualisation expertise, ideally VMware in highly available environments
• SAN and storage technologies (iSCSI, SAN administration)
• Enterprise Applications
• Deep knowledge of Active Directory, DNS, DHCP, and Group Policy
• Administration of SharePoint Online, Teams, and OneDrive
• Confident communicator with the ability to lead and mentor