Infrastructure Site Reliability Engineer

The role

You will run and evolve the infrastructure stack across bare-metal, virtualization, and orchestration layers. You will deploy and operate resilient infrastructure for AI/HPC workloads while mentoring teammates and improving automation.

What you will 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
• Apply ITSM frameworks: Incident, Major Incident, Change Management, and service improvement
• Maintain and enhance observability stack: Prometheus, Grafana, and custom monitoring integrations
• Operate and support services in 24x7 production environments, including on-call rotation
• Contribute to Incident postmortem analyses, root cause analysis, document learnings, and automate remediations
• Mentor junior engineers and act as an Operational requirements consultant to other departments
• Communicate technical decisions clearly to non-technical stakeholders and customers

Required qualifications

• 5+ Years Proven experience in globally scaled, performance-intensive environments operating to a 24/7 support model
• Expert-level Linux administration, especially Ubuntu distributions
• Proficiency in system tuning, disk I/O optimization, and hardware-level performance tweaks
• Familiarity with Out of Band management tools (IPMI, Redfish, PXE, etc.)
• Strong networking fundamentals: TCP/IP, DNS, DHCP, VLANs, routing, switching
• Strong experience with infrastructure scripting and automation (Bash, Python, Ansible)
• Deep understanding of observability principles and tools (Prometheus, Grafana)
• Hands-on experience operating orchestration platforms (Kubernetes, MAAS, Tinkerbell)
• Strong grasp of ITSM and service operation best practices
• Excellent communication and mentorship skills
• Comfortable interfacing with internal stakeholders and external customers

Nice to have

• Knowledge of HPC workloads and GPU-based infrastructure
• Experience with InfiniBand networks and HPC performance tuning
• Bachelor or Masters Level degree in Computer Science, Engineering or related field, or equivalent experience
• LPIC Certifications
• ITIL Foundation level qualification or equivalent experience

Benefits

• 25 days of annual leave
• Dedicated learning time
• Private medical insurance via Bupa
• Cycle to Work Scheme
• Gympass subscription to a variety of gyms and wellbeing apps
• Participation in the company shares program
• Enhanced parental pay & leave

About the company

Radiant designs and operates AI-native cloud platforms engineered for sovereignty, performance, and scale. They build purpose-built AI infrastructure from powered land to compute and software.