Salary: £65,000 - 70,000 per year Requirements: We require strong experience supporting enterprise IT infrastructure in a 3rd line or senior support capacity. We require relevant experience working in a cloud datacentre environment. We require up-to-date technical industry accreditations. We require Microsoft certifications covering M365, Endpoint, Security and Azure. We require Linux and networking certifications such as MCSE, Linux and CCNA. We require hands-on administration experience with Microsoft 365 and Azure. We require solid knowledge of networking, security principles and ITIL-based service delivery. We require strong troubleshooting, documentation and stakeholder communication skills. We require a proactive, adaptable team player who is comfortable working across a broad technical estate. We require London-based candidates or those within reasonable travel distance due to datacentre access and out-of-hours support needs. We require candidates who can participate in an on-call rota, including out-of-hours call-outs for critical infrastructure incidents. Responsibilities: We provide 3rd line support across Microsoft 365, Azure, AvePoint and third-party cloud platforms such as VoIP and CRM. We support and administer on-premises and cloud infrastructure, including Linux, Windows Server, VMware virtualisation, Veeam Backup & Replication and SAN technologies. We respond to, investigate and remediate incidents identified through security and monitoring platforms such as M365 XDR and MDR/SIEM tooling. We own incidents through their full lifecycle, ensuring SLA compliance and clear stakeholder communication. We work closely with 1st and 2nd line teams, providing escalation support and technical guidance. We identify root causes of recurring issues and propose system improvements, raising RFCs where required. We support project delivery and platform development initiatives. We maintain accurate system documentation, asset registers and inventory records. We act as a senior escalation point within the support function. We work with internal teams, vendors and project stakeholders to ensure high availability, security and performance of core IT services. Technologies: Azure Cloud CRM Support ITIL Linux Microsoft 365 Security VMware Veeam Windows Office 365 DevOps More: We are a fast-moving technology environment based in London, City, with off-site datacentre access required and a hybrid working pattern of 3 days on site per week. Reporting to our IT Infrastructure Manager, this role sits at the heart of our cloud, datacentre and enterprise systems support function, where we value high availability, security and performance. We offer a salary of £65,000 to £70,000 per annum plus benefits, and we need a London-based professional who can support critical infrastructure, participate in an on-call rota and work closely with our internal teams, vendors and project stakeholders. last updated 21 week of 2026