Senior Infrastructure Engineer 450 Per Day, Inside IR35 6-Month Contract Didcot, Oxfordshire Your new company We''re supporting a nationally significant scientific research organisation recognised for delivering some of the most advanced and high-impact projects in the UK. Their digital platforms underpin cutting-edge experiments, secure collaboration and large scale data processing, and they rely on a modern, resilient infrastructure estate to keep these environments running safely and efficiently. As part of their ongoing investment in core services, they are seeking an experienced Senior Infrastructure Engineer to maintain, support and enhance their Microsoft 365, server, storage and authentication systems. This is a place where your technical expertise will directly contribute to work used across the UK science and innovation landscape.Your new role You''ll take responsibility for the hands-on support and maintenance of both on-premise and cloud-based infrastructure. Most of your time will be spent supporting Microsoft 365 and Active Directory services, ensuring user access, directory health, security controls and core collaboration tools remain stable and well maintained. Alongside this, you''ll manage servers and virtual environments, resolve issues within the estate, and ensure systems are configured, patched and performing reliably. You''ll be the person teams turn to when complex IT problems arise, using your experience to troubleshoot effectively, diagnose root cau