Salary: £54,000 - 54,000 per year Requirements: Strong practical experience in IT infrastructure Solid understanding of Microsoft 365, Exchange Online, and Active Directory in both on-premise and multi-tenant environments Comfortable supporting servers, virtualized platforms, and cloud technologies Confidence to resolve complex issues related to identity, authentication, performance, and system reliability Experience with monitoring tools, backups, disaster recovery, and security processes Familiarity with certificates, load balancing, or Linux systems Strong troubleshooting skills Ability to manage workload effectively Disciplinary approach to producing clear documentation ITIL awareness and relevant Microsoft or infrastructure certifications are advantageous Ability to work on-site in Didcot two days per week Responsibilities: Support and maintain on-premise and cloud-based infrastructure Primarily support Microsoft 365 and Active Directory services Ensure user access, directory health, security controls, and core collaboration tools remain stable Manage servers and virtual environments Resolve issues within the infrastructure estate Ensure systems are configured, patched, and performing reliably Troubleshoot effectively and diagnose root causes for complex IT problems Maintain documentation and support certificate and authentication services Contribute to monitoring and BAU operations Help enforce security and backup standards across the organization Collaborate closely with other technical teams to meet user needs Technologies: Active Directory Cloud Support ITIL Linux Load Balancing Microsoft 365 Security Office 365 DevOps More: We are supporting a nationally significant scientific research organization recognized for delivering some of the most advanced and high-impact projects in the UK. Our digital platforms underpin cutting-edge experiments, secure collaboration, and large-scale data processing, relying on a modern, resilient infrastructure estate. We are seeking an experienced Senior Infrastructure Engineer to maintain, support, and enhance our Microsoft 365, server, storage, and authentication systems. Join us for an opportunity to work with a varied and modern technology stack and contribute to meaningful improvements in an environment valuing technical precision and strong engineering practice. last updated 15 week of 2026