Key responsibilities Infrastructure and systems administration

Administer and maintain on-premises Windows Server (and Linux where applicable) infrastructure, including physical hosts, virtualisation platform (Hyper-V/VMware), storage and server-room equipment (UPS, environmental monitoring).

Administer Active Directory, Entra ID and hybrid identity synchronisation, DNS, DHCP and Group Policy.

Administer the Microsoft 365 tenant (Exchange Online, Teams, SharePoint, OneDrive), including licensing, access and security configuration. ·

Confidential – for internal and recruitment useSenior IT Administrator ·

Manage cloud services in use (e.g. Azure) and the integration between on-premises and cloud workloads.

Plan and apply patching, firmware updates, capacity monitoring and routine maintenance across servers, endpoints and network devices within agreed change windows.

Maintain server documentation: build standards, inventory of hosts and VMs, and hardware support/warranty status. Network

Maintain and troubleshoot LAN, WAN, Wi-Fi, firewall and VPN connectivity. ▪ Keep network diagrams, IP addressing plans and configuration documentation current. Security, backup and continuity

Implement and monitor security controls: endpoint protection, MFA, conditional access, email security and vulnerability remediation.

Manage backup schedules for on-premises and cloud workloads, verify completion, perform regular restore tests, and maintain and test DR procedures including off-site or immutable copies.

Review monitoring alerts and logs, and respond to incidents according to the incident-response process.

Act as the senior escalation point for out-of-hours incidents affecting critical systems; own the on-call rota and ensure it is staffed and fair. Service desk, support and escalation

Act as second- and third-line escalation point for the IT support team; resolve complex hardware, software and network issues.

Handle tickets escalated by the IT Administrators and ensure the team meets service-desk SLAs.

Support desktops, laptops, mobile devices, printers and peripherals when escalated. ▪ Provision and deprovision user accounts, mailboxes and access rights in line with joiner/mover/leaver and security policies.

Engage vendors and third-party providers on unresolved issues; manage supplier SLAs and hold them to account. Runbooks, documentation and knowledge

Own the runbooks and standard operating procedures for all critical systems (server restart and recovery, backup and restore, failover, patching, user provisioning) and keep them accurate and up to date at all times.

Review and update the affected runbooks after every change, upgrade, incident or configuration adjustment; no change is closed until its documentation is updated.

Conduct a scheduled review of all runbooks at least quarterly and record the review date and owner on each.

Build and maintain the internal knowledge base for recurring issues and their resolutions. Technical guidance and team

Provide technical guidance and coaching to junior IT staff; act as the go-to for complex issues. ▪ Help plan workload and coverage across the team in coordination with IT management.

Define the user training plan for M365 and core business tools; delivery is carried out by the IT Administrators. Confidential – for internal and recruitment useSenior IT Administrator ·

Contribute to IT projects, upgrades and improvement initiatives; keep up with relevant technologies and best practice. Asset and licence management

Maintain an accurate IT asset inventory (hardware, software, serial numbers, licence keys, warranties, renewal dates) and initiate reorders and renewals in good time. Cognate duties

Perform any other duties reasonably related to the role as assigned by IT management, including project support, site visits and cover for the IT Administrators during absence

The Senior IT Administrator is the senior technical resource for the organisation's IT infrastructure — onpremises servers and server rooms, virtualisation and storage, networks, cloud services, identity, endpoints, backups and enterprise applications. The role is the primary escalation point for the IT support team, guides junior staff on technical matters, coordinates supplier resolution and SLAs, and ensures IT services are available, secure and performant in support of business continuity. The role owns the runbooks and operational documentation and is accountable for keeping them current. The position is expected to grow into the IT Administrator Lead role, taking on team coordination and planning responsibilities over time.EssentialDiploma or degree in computing, information systems or a related field, or equivalent experience.4+ years in system and network administration, with demonstrated end-to-end ownership of systems (not just ticket resolution).Strong hands-on experience with on-premises Windows Server, Hyper-V or VMware, Active Directory/Entra ID (hybrid), Group Policy, DNS/DHCP and Microsoft 365 administration.Solid networking knowledge: routing, switching, VLANs, firewalls, Wi-Fi and VPN. ▪ Experience with server hardware, storage and backup tools, including restore and DR testing.Working knowledge of IT security practices (patching, endpoint protection, MFA, access control).Familiarity with monitoring tools and IT service management (ITIL-style incident, request and change processes).Proven documentation discipline: has written and maintained runbooks and SOPs and treats documentation as part of the job, not an afterthought.Strong analytical and troubleshooting skills; able to prioritise under pressure. ▪ Clear written and verbal communication; able to explain technical issues to non-technical users and coach junior staff.Some experience guiding or informally leading others, and interest in progressing into a team lead role.DesirableCertifications such as CompTIA Network+/Security+, CCNA, Microsoft AZ-104 or MS-102, or ITIL Foundation. ▪ PowerShell or other scripting for automation.Experience with Azure or other cloud platforms.Experience with Linux server administration.Experience with server hardware lifecycle (RAID, iDRAC/iLO, firmware management).Experience managing suppliers and SLAs.