Principal Security Platform Engineer

Academic Key; United Kingdom; On-site; GBP 120,000 - 160,000; Full time

Job summary

Radiant in the United Kingdom is seeking a Principal Software Engineer – Security to shape the security direction of the cloud platform. You will lead design and delivery of IAM, encryption, auditing, and policy enforcement, partnering with multiple teams and customers on demanding security requirements.

You will drive automation, risk-aware architecture, and scalable security controls across the control and data planes, mentoring teams and raising engineering standards throughout the

Qualifications

• Strong hands-on engineering in Go or similar languages.
• Extensive experience building and operating large-scale distributed systems.
• Deep cloud and network security, IAM, or security infrastructure expertise.
• Technical leadership at staff or principal level across multiple teams.
• Familiarity with SOC 2 / ISO 27001 controls and compliant architectures.

Responsibilities

• Set technical vision and architecture for security systems across the platform.
• Design and implement core security services: IAM, RBAC, encryption, audit logging, and policy enforcement.
• Drive automation of policy enforcement, hardening, detection, and software supply chain security.
• Lead security reviews with enterprise customers and audits; mentor engineers.
• Balance security with performance and developer experience while maintaining least privilege.

Skills

Go

Distributed systems

Cloud security

IAM / RBAC / SSO

Security leadership

Tools

Vault

OPA Gatekeeper

SPIFFE/SPIRE

Kubernetes security tooling

Sigstore / SBOMs

Job description

Radiant in the United Kingdom is seeking a Principal Software Engineer – Security to shape the security direction of the cloud platform. You will lead design and delivery of IAM, encryption, auditing, and policy enforcement, partnering with multiple teams and customers on demanding security requirements.

You will drive automation, risk-aware architecture, and scalable security controls across the control and data planes, mentoring teams and raising engineering standards throughout the