Linux Systems Administrator in Wallingford

At HR Wallingford, we design smart, resilient solutions across the natural and built environments to help everyone live and work more sustainably with water. By harnessing research, data insights and the power of our collective expertise, we help the world to better understand the changing influence and impact of water.

We are seeking a skilled System Administrator to join our IT team at our Head Office in Wallingford. This office-based role offers the opportunity to work in a dynamic technical environment, providing effective solutions to escalated technical issues and delivering high-level expertise across Linux-hosted services.

• Administer and support existing Linux solutions across multi-site environments, ensuring smooth operation of services hosted on-premise and within AWS and Azure public cloud environments.
• Act as escalation point for frontline support; collaborate with internal teams, third-party suppliers, and external contractors to maintain and enhance IT infrastructure.
• Assist with patching cycles, day-to-day technical operations, and monitoring activities such as backup checks; support deployed DevOps services on-premise and in public cloud environments.
• Respond to IT support requests via ServiceDesk, phone, or in person to ensure timely and effective resolution.
• Participate in projects implementing new or replacement Linux-based solutions; produce and collate reports for management; maintain accurate documentation; provide occasional out-of-hours support for critical operations, including patching cycles.

• Bachelor’s degree in technology or computer science, relevant IT certifications, or equivalent demonstrable experience.
• Strong technical expertise in administering and managing Linux High Performance Computing (HPC) clusters, alongside significant experience with cloud architectures (AWS, Azure), SaaS solutions, and virtualization technologies (Hyper-V, Proxmox).
• Background includes performance analysis, compiling and debugging on Linux systems, and implementing automation tools such as Ansible or SaltStack.
• Familiarity with Microsoft applications and Office 365, desktop and server hardware deployment, networking (TCP/IP, switches, routers, wireless), and security technologies including firewalls, VPNs, and intrusion detection systems.
• Experience using IT ServiceDesk workflows, scripting and coding languages (including awareness of AI applications), and applying ITIL principles is essential.
• Ability to create clear technical documentation, configuration guides, and runbooks.
• Enthusiastic about technology, a fast learner, proactive in finding solutions, and demonstrate excellent communication skills with the ability to work independently and as part of a team.
• Maintain a calm, professional approach under pressure while delivering high levels of customer satisfaction.

We value diverse perspectives and welcome candidates who bring curiosity, empathy, and a commitment to continuous learning.

This role needs to be within a good commutable distance to our offices in Wallingford, Oxfordshire as it is office based at our Wallingford office. We support flexible working arrangements to help balance professional and personal commitments.

Salary: from £40,000 - £45,000 plus benefits, depending on experience. The closing date is Friday 27 February 2026.

If you are excited about this role but unsure whether you’re the right fit, we encourage you to apply. We’re also happy to answer any questions by emailing careers@hrwallingford.com. Interested? Please apply, providing your CV with a covering letter.

HR Wallingford are an equal opportunity employer and value diversity in our workplace. We do not discriminate, and work to create an inclusive culture across our business. Our privacy notice for job applicants, available from our website, explains how we collect and process the personal data you may provide us when you apply for a job with us through our websites, or by any other means. This notice also explains how we’ll store and handle that data.