Infrastructure Site Reliability Engineer

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About this role

Infrastructure Site Reliability Engineer Gloucestershire, United Kingdom About Radiant Radiant is redefining how AI infrastructure is built. We design and operate AI-native cloud platforms engineered for sovereignty, performance, and scale. Our infrastructure powers GPU-native workloads, multi-tenant control planes, and high-performance AI systems designed for the most demanding environments. We are not building a generic cloud. We are building purpose-built AI infrastructure - from powered land, to compute, to software . As we scale our platform and expand our engineering organisation, we are looking for leaders who can build strong teams, uphold high standards, and deliver reliably at pace. Job Summary: We're looking for an experienced Infrastructure Site Reliability Engineer to run and evolve our infrastructure stack. You'll contribute across bare-metal, virtualization, and orchestration layers, keeping things stable and secure 24/7 x 365 - all while mentoring teammates, improving process and automation as well as helping translate deep technical concepts for a wide range of collaborators and customers. What You'll Do : - Deploy and operate resilient, scalable infrastructure supporting AI/HPC workloads - Optimize Linux system configuration, BIOS/firmware, kernel, and disk subsystem for performance - Configure, monitor and manage bare-metal infrastructure using IPMI, Redfish, etc - Build and maintain automation scripts and infrastructure as code to support platform lifecycle, as well as simplifying troubleshooting for Incident resolution and provision of tooling for our support organisation - Apply ITSM frameworks: Incident, Major Incident, Change Management, and service improvement. - Maintain and enhance 's observability stack: Prometheus, Grafana, and custom monitoring integrations -

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