Principal Platform Engineer — AI Infra & Kubernetes Leader

Radiant; United Kingdom; On-site; GBP 120,000 - 180,000; Full time

Benefits offered by this job

25 days annual leave

Private medical insurance (via Bupa)

Cycle to Work Scheme

Gympass subscription

Participation in company shares

Enhanced parental pay & leave

Job summary

Radiant seeks a Principal Platform Engineer to define the technical direction for a major platform that supports GPU clusters, Kubernetes, and managed services. You will collaborate with SRE, Infra Ops, and other platform engineers to ensure reliability and secure, scalable operations.

You will lead architecture, drive infrastructure-as-code, and establish standards across teams while mentoring engineers and shaping the platform's evolution.

Qualifications

• Extensive experience in platform, infrastructure, or SRE engineering at scale.
• A track record of technical leadership at staff or principal level, including setting direction across multiple teams and delivering complex, high-stakes systems.
• Strong hands-on engineering skills in Go, Python, or similar.
• Deep technical expertise across: Kubernetes and containers in production, including operators; Infrastructure-as-code and configuration management (e.g. Terraform, Ansible); CI/CD, release engineering, and GitOps; Linux, networking, and cloud or bare-metal infrastructure.
• Experience with GPU, HPC, or bare-metal platforms is a strong plus.
• Excellent written and verbal communication, including clear design documents and explaining complex trade-offs to technical and non-technical audiences.

Responsibilities

• Set the platform architecture and roadmap for your team, and lead its design and implementation.
• Lead infrastructure-as-code, automation, and deployment at scale.
• Make environments reproducible, secure, and fast to change.
• Own the reliability and operability of the platform, with SRE and Infra Ops.
• Define standards for CI/CD, observability, and configuration across teams.
• Raise the engineering bar through mentoring, design and code review, and technical standards.

Skills

Platform thinking

Engineering excellence

Architectural judgement

Technical leadership

Systems thinking

Ownership

Education

Bachelor's degree in Computer Science

Tools

Kubernetes

Terraform

Ansible

Go

Python

Linux

Job description

Radiant seeks a Principal Platform Engineer to define the technical direction for a major platform that supports GPU clusters, Kubernetes, and managed services. You will collaborate with SRE, Infra Ops, and other platform engineers to ensure reliability and secure, scalable operations.

You will lead architecture, drive infrastructure-as-code, and establish standards across teams while mentoring engineers and shaping the platform's evolution.