3rd Line Support Engineer

Are you a senior support engineer who enjoys being the go-to technical expert on site, rather than sitting in endless ticket queues? 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 What We're Looking For 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 Why This Role?

Senior onsite role with real technical authority Exposure to complex, enterprise-scale environments Structured learning and development pathways Ongoing access to technical training and certifications Supportive team culture with clear progression opportunities If you're looking for onsite ownership, technical depth, and long-term progression, I'd be happy to have a confidential conversation.

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