Salary: £52,485 - 78,542 per year Requirements: Proven experience as a Senior Systems Administrator / Infrastructure Engineer in large enterprise environments Strong Windows Server, Active Directory, and Microsoft SQL experience Experience supporting Microsoft 365, Azure, and hybrid environments Solid understanding of cybersecurity, patching, and compliance frameworks Strong networking fundamentals (DNS, DHCP, VPNs, firewalls) Excellent documentation, troubleshooting, and stakeholder engagement skills ITIL, PRINCE2, or similar service/project management certification (desirable) Experience working in the NHS, public sector, or highly regulated environments (desirable) Experience supporting estates, facilities, or OT-adjacent systems (desirable) Experience mentoring or guiding junior engineers (desirable) Responsibilities: Administer and maintain enterprise IT systems and third-party devices, following best-practice lifecycle management Perform advanced system monitoring to ensure availability, performance, and integrity Embed operational best practice across systems, processes, and teams Maintain IT asset data with automated monitoring and reporting Enforce cybersecurity standards and carry out vulnerability management Ensure compliance with security, Information Governance, and NHS frameworks Manage security tooling, patching, and hardening activities Support BIA, BCP, and recovery practices Support and manage cloud environments in collaboration with suppliers Administer Microsoft 365 services including Teams and SharePoint Online Manage Identity & Access Management using Microsoft Entra ID (MFA, Conditional Access, user provisioning) Contribute to system maturity and continuous improvement frameworks Provide support across WiFi, firewalls, VPNs, and core networking services Apply strong knowledge of DNS, DHCP, TCP/IP, switches, and routers Monitor and optimise system performance for high availability Act as escalation point for complex 2nd/3rd line incidents Provide expert support for business-critical systems (e.g. CAFM and estates platforms) Diagnose and resolve infrastructure, application, and network issues in line with SLAs Work closely with external vendors and service providers Maintain configuration management, technical documentation, and operational processes Ensure secure storage, backup, and recoverability of systems and data Technologies: Active Directory Azure CAFM Cloud Support ITIL Microsoft 365 Network SQL Security SharePoint TCP/IP Windows Office 365 More: We are a large NHS organisation based in Cambridge, looking to recruit an experienced Senior Systems Administrator for a 6-month contract engagement. This role operates at the intersection of Information Technology (IT) and Operational Technology (OT), supporting critical systems across estates and facilities teams in a highly regulated healthcare environment. We offer competitive rates and the opportunity to work in a hybrid/onsite capacity, contributing to the reliability and security of our enterprise infrastructure and systems. last updated 8 week of 2026