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# Principal Platform Engineer

- **Company:** Radiant
- **Location:** United Kingdom
- **Contract:** Permanent contract
- **Skills:** Computer Clusters, Configuration Management, Code Review, Continuous Integration, Software Design Documents, Linux, Python (Programming Language), Ansible, AI Infrastructure, Cloud Platform System, Git Flow, Kubernetes, Bare Metal, Terraform
- **Published:** November 11, 2026
- **Apply:** https://startup.jobs/principal-platform-engineer-radiant-10735844

## About the Role

* 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.

## Description

As a Principal Platform Engineer, you will help set the technical direction for the platform one of our engineering teams builds on: the infrastructure, tooling, and automation that let us run GPU clusters, Kubernetes, and our managed services reliably at scale.

You'll partner closely with software engineers, SRE, Infra Ops, and the other platform engineers across Radiant., * 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., * Engineering excellence: Write and review code that sets the standard for correctness, performance, and maintainability.
 * Architectural judgement: Make sound long-term decisions on systems that are hard to change once built.
 * Technical leadership: Influence direction across teams without relying on authority, and grow the engineers around you.
 * Systems thinking: Understand how your area interacts with compute, networking, storage, and the rest of the cloud platform.
 * Ownership: Drive capabilities from design through production, operation, and continuous improvement., * Open communication, regular feedback: we value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and a growth mindset makes us better together.
 * Learning Time: we all have dedicated learning time to focus on new skills, projects or interests that lay outside of your day-to-day job.
 * Health & Wellbeing: we want everyone to feel healthy and happy, so we offer private medical insurance via Bupa.
 * Cycle to Work Scheme: we're committed to building a sustainable business, so we encourage cycling to work.
 * Gympass subscription to a variety of gyms and wellbeing apps
 * Participation in the company shares program
 * Enhanced parental pay & leave

Our process: Talent screen * Hiring Manager * Technical interview (two Principal Engineers) * Whiteboard * Session Final.