Global Cloud Support Engineer (AI/HPC) 24/7 On-Call

Radiant; Greater London; On-site; GBP 60,000 - 90,000; Full time

Benefits offered by this job

25 days annual leave

Private medical insurance (Bupa)

Cycle to Work Scheme

Gympass access

Company shares program

Enhanced parental pay & leave

Job summary

Radiant seeks a Cloud Infrastructure Support Engineer to join our global Customer Support team. You will triage, diagnose, and resolve complex infrastructure incidents across Radiant’s Cloud Platform, HPC, and AI supercomputing environments, while delivering exceptional customer experiences.

As a hands-on professional, you will support a 24/7 follow-the-sun model, collaborate with Engineering and external vendors, and contribute to deployment and knowledge-sharing efforts in a fast‑growing AI

Qualifications

• Degree in Computer Science or a related STEM subject, or equivalent industry experience.
• 3–5+ years of experience in a customer‑facing technical support or cloud operations role.
• Proven experience working with cloud, datacenter, and Linux environments.
• Strong foundation in Linux system administration.
• Familiarity with IT service management practices (e.g. ITIL concepts) is desirable.
• Strong problem‑solving skills and the ability to troubleshoot complex technical issues under pressure.
• Excellent written and spoken communication skills (English), with the ability to explain technical concepts clearly to customers and internal teams.
• A proactive, curious mindset and the resilience to thrive in a fast‑paced, evolving environment.

Responsibilities

• Maintain the highest levels of customer satisfaction and establish Radiant as a top cloud provider.
• Deliver outstanding customer support with timely, professional assistance.
• Respond to incoming customer queries and own incidents from triage to resolution.
• Advanced troubleshooting across cloud, Linux, and datacenter environments, with workarounds when needed.
• Escalate complex issues to L3/L4 support and coordinate corrective actions.
• Participate in a 24/7 follow-the-sun support model and on-call rotations.
• Collaborate with third‑party vendors to accelerate resolutions.
• Assist with deployment of new AI supercomputers and related validation tasks.
• Contribute to internal documentation and runbooks for knowledge reuse.
• Engage in retrospectives and process improvements with multiple teams.

Skills

Customer-facing support

Linux administration

ITIL awareness

English communication

Problem solving

Education

Degree in Computer Science or STEM

Tools

Cloud platforms

Datacenter hardware

Job description

Radiant seeks a Cloud Infrastructure Support Engineer to join our global Customer Support team. You will triage, diagnose, and resolve complex infrastructure incidents across Radiant’s Cloud Platform, HPC, and AI supercomputing environments, while delivering exceptional customer experiences.

As a hands-on professional, you will support a 24/7 follow-the-sun model, collaborate with Engineering and external vendors, and contribute to deployment and knowledge-sharing efforts in a fast‑growing AI