Senior HPC Infra SRE: GPU Compute, 24/7 Reliability

Radiant; Greater London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Radiant is seeking a senior Infrastructure Site Reliability Engineer for its GPU-accelerated HPC platforms. You will own reliability and performance across large-scale distributed systems, operating in a 24/7 on-call environment.

The role demands deep Linux administration, extensive HPC experience, and strong collaboration with Platform, Network, and Data Centre teams to improve observability and drive automation at scale.

Qualifications

• 8+ years in Site Reliability or similar roles.
• 2–3+ years in HPC/AI infra.
• Strong Linux administration and troubleshooting.
• Experience with ITIL-aligned processes.
• Experience with GPU/InfiniBand/NVIDIA ecosystems.

Responsibilities

• Operate and improve 24/7 HPC infrastructure.
• Lead on-call rotation and incident response.
• Drive CSI and automation for reliability.
• Collaborate across Platform, Network, and Data Centre teams.
• Contribute to future HPC design.

Skills

SRE experience

HPC/AI infra

Linux systems

Performance tuning

Bare-metal infra

Networking fundamentals

NVIDIA GPUs

Ansible/Python

Observability

ITIL processes

Education

Bachelor or Masters in CS/Engineering

Tools

IPMI/iLO/iDRAC

Redfish

Prometheus/Grafana

Kubernetes exposure

Job description

Radiant is seeking a senior Infrastructure Site Reliability Engineer for its GPU-accelerated HPC platforms. You will own reliability and performance across large-scale distributed systems, operating in a 24/7 on-call environment.

The role demands deep Linux administration, extensive HPC experience, and strong collaboration with Platform, Network, and Data Centre teams to improve observability and drive automation at scale.