Infrastructure Site Reliability Engineer

About the role

Radiant is building purpose‑built AI infrastructure and needs an experienced Infrastructure Site Reliability Engineer to run and evolve its bare‑metal, virtualization and orchestration stack. You will ensure 24/7 stability, security and performance for AI/HPC workloads while mentoring teammates and improving automation.

Key responsibilities

• Deploy and operate resilient, scalable infrastructure supporting AI/HPC workloads.
• Optimize Linux system configuration, BIOS/firmware, kernel and disk subsystems for performance.
• Configure, monitor and manage bare‑metal infrastructure using IPMI, Redfish, PXE, etc.
• Build and maintain automation scripts and infrastructure‑as‑code (Bash, Python, Ansible).
• Maintain observability stack (Prometheus, Grafana) and handle incident, major incident and change management processes.
• Participate in on‑call rotation, incident post‑mortems and automate remediations.

Required profile

• 5+ years experience in globally scaled, performance‑intensive environments with 24/7 support.
• Expert‑level Linux administration (Ubuntu) and system‑tuning expertise.
• Strong networking fundamentals (TCP/IP, DNS, DHCP, VLANs, routing, switching).
• Experience with orchestration platforms such as Kubernetes, MAAS and Tinkerbell.
• Excellent communication and mentorship skills.

Required skills

• Linux (Ubuntu)
• Bash, Python, Ansible
• IPMI, Redfish, PXE
• Prometheus, Grafana
• Kubernetes, MAAS, Tinkerbell
• TCP/IP, DNS, DHCP, VLANs, routing, switching
• ITSM, Incident Management, Change Management

What we offer

• 25 days of annual leave.
• Private medical insurance via Bupa.
• Learning time for personal development.
• Cycle‑to‑Work scheme and Gympass subscription.
• Company shares programme and enhanced parental pay.
• Inclusive, results‑focused culture with open communication.