Infrastructure Site Reliability Engineer

About the role

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

- 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

- Uphold a culture of: do, document, automate

- Willingness to cross train with Platform Engineering/Platform SRE to fully support both our infrastructure and platform stacks.

- Willingness to cross train with HPC Engineering, supported by NVIDIA to enhance our

- HPC supportability offering

What you bring:

- 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