Senior Systems Administrator

Senior Systems Administrator (Contract)Rate: £500–£600 per day (Umbrella) – Inside IR35Duration: 12 monthsLocation: SomersetWorking model: Hybrid (2–3 days on-site per week)Clearance: Active SC requiredWe’re recruiting for an experienced Senior Systems Administrator to join a high-performing technical operations team supporting and improving a complex enterprise infrastructure estate. You’ll provide hands-on 3rd line support, lead platform enhancements, and contribute to the design and delivery of resilient, secure services across on-prem and cloud.The roleProvide 3rd line support across core infrastructure platforms (server, storage, networking, cloud).Design, configure, test and implement improvements to meet complex business and operational needs.Maintain operational health across availability, performance, security, patching, backup/restore and resilience.Work closely with technical teams, service management and vendors to resolve high-impact incidents and deliver changes.Produce documentation, standards and operational procedures to support audit and governance.Participate in an on-call rota for out-of-hours support.Key technologiesWindows Server 2016/2019+Microsoft Hyper-V / enterprise virtualisationActive Directory, File Services, SCCM, DHCP, Failover ClusteringNetApp or equivalent enterprise storageExchange / Office 365 hybrid environmentsPowerShellLinuxIP networking / troubleshootingCloud: Azure, AWS, Google CloudContainers (cloud or on-prem)What we’re looking forStrong background in enterprise server and storage administration at a senior/technical lead level.Proven experience designing and delivering infrastructure improvements in complex environments.Solid understanding of IT security best practice within regulated/government-style settings.Skilled at root cause analysis and implementing proactive fixes that reduce incident volume.Comfortable engaging both technical and non-technical stakeholders.DesirableExperience building admin tooling/automation or scripting beyond day-to-day ops.Exposure to broader architecture or technical assurance activities.Additional infoThis is a long-term contract with a mix of BAU and project-based platform improvement.The team environment is collaborative, with scope to lead on technical decisions and service enhancement.

Created: 2025-12-12