Principal Systems Administrator

Addition; Cheltenham; On-site; GBP 65,000 - 90,000; Full time

Job summary

Addition in Cheltenham is seeking an experienced IT infrastructure leader to guide enterprise systems, spanning VMware, Citrix, and cloud services. You will drive architecture decisions, administer complex environments, and collaborate with vendors to keep operations resilient.

The role requires leadership, hands-on troubleshooting, and a proactive approach to security and ISO standards, with UK travel and on-call duties as needed.

Qualifications

• Bachelor’s degree in Computer Science, Information Technology, or related field.
• Extensive professional experience in enterprise system administration and support.
• Willingness to travel within the UK and occasionally to EMEA or US offices.
• Ability to work flexibly, including on-call rotations.

Responsibilities

• Deliver advanced technical leadership across enterprise infrastructure.
• Administer complex systems and ensure stable operations.
• Collaborate with top vendors to maintain and enhance infrastructure.
• Support high-stakes projects and provide strategic recommendations.

Skills

VMware vSphere

Fiber Channel

Citrix XenApp/XenDesktop

Windows Server 2019/2022

Exchange

Office 365

SQL Server

Linux

Ansible

AD Federated Trusts

TCP/IP

DHCP

DNS

MPLS

SC clearance

ISO20000

ISO27001

ITIL

Agile

Scrum

AWS

Azure

Certificate Authorities

Education

Bachelor’s degree in Computer Science/IT

Job description

Are you a visionary IT professional ready to lead and innovate at the forefront of enterprise infrastructure? This role offers an opportunity to provide expert guidance, craft innovative solutions, and support high-stakes projects that make a real impact.

As a key member of the team, you'll deliver advanced technical leadership, administer complex systems, and collaborate with top vendors to maintain and enhance infrastructure. Your expertise will help ensure seamless operations across a variety of platforms, from VMware and Citrix to cloud services and enterprise databases. If you thrive in dynamic environments and possess a strong problem-solving mindset, we want to hear from you.

Required Skills:

• Substantial experience supporting VMware vSphere 8.0+, Fiber Channel Storage Technologies (Dell, NetApp), and Citrix XenApp/XenDesktop
• Proven ability to administer and troubleshoot Microsoft OS 2019/2022, Exchange, and Office 365
• Strong knowledge of SQL Server (MS SQL 2019) and database management
• Hands-on experience with Linux and automation tools like Ansible
• Expertise in Active Directory Federated trusts and network protocols including TCP/IP, DHCP, DNS, MPLS
• Security clearance: Sole UK National capable of obtaining and maintaining SC clearance
• Exceptional problem-solving skills and ability to lead complex projects and provide strategic recommendations
• Experience working within ISO20000 & ISO27001 standards

Nice to Have Skills:

• Cloud platform experience with AWS and Azure
• Administrative expertise in Certificate Authorities
• Project management familiarity including ITIL, Agile, and Scrum methodologies
• Advanced networking and security knowledge

Preferred Education and Experience:

• Bachelor’s degree in Computer Science, Information Technology, or related field
• Extensive professional experience in enterprise system administration and support

Other Requirements:

• Willingness to travel within the UK and occasionally to EMEA or US offices
• Ability to work flexibly, including participating in 24/7 on-call rotations

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.