Sr Platform Security Engineer; Zero Trust and Platform Security

Europe

Start: ASAP

Type of

Contract:

Full-time (permanent or freeelance)

About Radian Arc

We’re specialists in outcome-optimized AI infrastructure - deploying, orchestrating and monetizing GPU compute where data, users and demand actually meet: inside telco networks, at the edge, and in core data centers.

Not a generic AI platform. Not a consultancy. We’re the bridge between raw silicon and real-world results.

What impact you will have

Design and implement key security capabilities for the GPU cloud platform, ensuring that infrastructure, control planes, and multi-tenant workloads operate within a robust zero-trust security model.

This role focuses on securing the platform across identity, networking, infrastructure, platform, and automation layers while enabling high-performance AI workloads to run safely in multi-tenant environments.

As a Senior Platform Security Engineer, you will build security capabilities that integrate deeply with the platform, infrastructure stack, and operational tooling, enabling secure-by-design infrastructure  will also leverage automation and AI-assisted tooling to improve detection, triage, and response across the platform security stack.

What you’ll do

• Design and implement zero-trust security architecture across the platform.
• Implement identity-aware access controls for infrastructure, services, and operators.
• Enforce least-privilege access models for both internal teams and customers.
• Secure access paths to infrastructure components including:
• Control planes,
• Orchestration systems,
• Management networks,
• Operational tooling.

• Design and operate secure authentication and authorization systems.
• Implement IAM capabilities for multi-tenant environments in collaboration with platform and infrastructure teams.
• Integrate identity systems with infrastructure and platform components.
• Manage cryptographic infrastructure including:
• PKI systems,
• Key management,

• Secure the underlying infrastructure used by the GPU cloud platform, including:
• Storage systems,
• Networking fabrics.
• Collaborate with infrastructure teams to ensure security is embedded in platform architecture and deployment practices.
• Contribute to security guardrails and secure deployment patterns for new infrastructure.

• Design and implement security controls for large-scale distributed infrastructure networks.
• Implement secure segmentation and tenant isolation mechanisms using technologies such as:
• EVPN / VXLAN,
• VRF isolation,
• Encrypted transport,
• Zero-trust networking.
• Work with networking teams to secure high-performance fabrics including RDMA and Infini Band environments.

• Develop automation workflows that improve detection, response, and remediation.
• Build integrations between security systems and operational tooling.
• Automate vulnerability triage, remediation workflows, and incident response processes.
• Contribute to SOAR-style automation systems that coordinate security operations across the platform.
• Support security monitoring and detection systems.
• Investigate and triage security alerts and potential vulnerabilities.
• Participate in incident response and post-incident analysis.
• Improve detection coverage and response automation across the platform.

• Design and maintain patch management strategies across the platform infrastructure, including:
• Operating systems,
• Build automation pipelines that validate and deploy security updates across large infrastructure fleets.
• Track vulnerabilities and coordinate remediation across engineering teams.
• Maintain vulnerability remediation workflows and reporting for security posture visibility.