Principal Software Engineer - Security

What You'll Do

As a Principal Software Engineer - Security, you will help set the technical direction for Radiant's security capabilities across the cloud platform and infrastructure, leading the design and delivery of the systems that underpin them.

You'll work across identity, access control, secrets, network security, platform hardening, auditability, and compliance controls. You'll partner closely with product, infrastructure, SRE, networking, security, and compliance teams, and with customers on their most demanding security requirements.

This is a hands-on technical leadership role focused on making security embedded, scalable, automated, and easy to consume across the platform, through architecture, code, and the standards other teams build on.

Key Responsibilities

• Set the technical vision and architecture for security systems and platform capabilities, and lead their design and implementation.

• Design and build core security services across IAM, RBAC, workload identity, secrets, encryption and key management, audit logging, network controls, and policy enforcement.

• Translate product, customer, and regulatory requirements into robust architectures, APIs, and technical designs, working closely with the Security Product Manager.

• Drive automation of policy enforcement, configuration hardening, detection, remediation, and software supply chain security.

• Ensure strong tenant isolation and least-privilege access across the control plane and network and data plane.

• Act as a senior technical voice in enterprise customer security reviews, audits, and incident response.

• Raise the security engineering bar across the organisation through mentoring, code review, and technical standards.

Your Profile

• Strong hands-on engineering skills in one or more systems languages such as Go or similar.

• Extensive experience building and operating large-scale distributed systems, with significant depth in cloud and network security, IAM, or security infrastructure.

• A track record of technical leadership at staff or principal level, including setting direction across multiple teams and delivering complex, high-stakes systems.

• Deep technical expertise across:

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