Senior Systems Administrator

Experis UK; West of England; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading IT staffing firm is seeking a Senior Systems Administrator for a long-term contract in the West of England. The role involves providing 3rd line support, designing improvements for a complex infrastructure, and maintaining operational health across systems. Candidates should have a strong background in enterprise server administration, particularly with Windows Server, cloud technologies, and IT security best practices. The position offers a hybrid working model with a daily rate of £500–£600.

Qualifications

• Strong background in enterprise server and storage administration at a senior level.
• Proven experience designing and delivering infrastructure improvements.
• Solid understanding of IT security best practices.

Responsibilities

• Provide 3rd line support across core infrastructure platforms.
• Design and implement improvements meeting business and operational needs.
• Maintain operational health across performance, security, and resilience.

Skills

Windows Server 2016 / 2019+

Microsoft Hyper-V / enterprise virtualization

Active Directory

PowerShell

Cloud: Azure, AWS, Google Cloud

IP networking / troubleshooting

Linux

Job description

Senior Systems Administrator (Contract)

Rate : £500–£600 per day (Umbrella) – Inside IR35

Duration : 12 months

Location : Somerset

Working model : Hybrid (2–3 days on-site per week)

Clearance : Active SC required

We’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 role

• Provide 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 technologies

• Windows Server 2016 / 2019+
• Microsoft Hyper-V / enterprise virtualisation
• Active Directory , File Services, SCCM , DHCP , Failover Clustering
• NetApp or equivalent enterprise storage
• Exchange / Office 365 hybrid environments
• PowerShell
• Linux
• IP networking / troubleshooting
• Cloud : Azure , AWS , Google Cloud
• Containers (cloud or on-prem)

What we’re looking for

• Strong 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.

Desirable

• Experience building admin tooling / automation or scripting beyond day-to-day ops.
• Exposure to broader architecture or technical assurance activities.

Additional info

• This 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.