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 DoingActing as the senior onsite escalation point for complex technical incidentsOwning investigation, diagnosis, and resolution of 3rd line issuesSupporting and managing internal infrastructure alongside ad-hoc project workProviding technical leadership through mentoring and guidance of junior engineersManaging client expectations through clear, professional communicationEnsuring incidents, changes, and time entries are accurately loggedMaintaining and updating technical documentation as environments evolveWorking closely with the Service Delivery Manager to align on service standardsSupporting continuous service improvement and wider team objectivesWhat We’re Looking ForProven experience working onsite at a client premises in a senior support capacityStrong hands-on experience with Microsoft Exchange and Microsoft 365Advanced networking knowledge (TCP/IP, routing, switching, NGFWs)VPN experience (site-to-site and remote access)Virtualisation expertise, ideally VMware in highly available environmentsSAN and storage technologies (iSCSI, SAN administration)Enterprise ApplicationsDeep knowledge of Active Directory, DNS, DHCP, and Group PolicyAdministration of SharePoint Online, Teams, and OneDriveConfident communicator with the ability to lead and mentorWhy This Role?Senior onsite role with real technical authorityExposure to complex, enterprise-scale environmentsStructured learning and development pathwaysOngoing access to technical training and certificationsSupportive team culture with clear progression opportunitiesIf 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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