Sr Platform Security Engineer (Zero Trust and Platform Security)

Location work modality: Europe (remote) Start: ASAP Type of Contract: Full-time (permanent or freeelance) About Radian Arc Radian Arc, now part of InferX, Submer's AI cloud and GPU infrastructure platform, provides an infrastructure-as-a-service (IaaS) platform for running cloud gaming, artificial intelligence and machine learning applications inside telecommunication carrier networks. Our teams across the USA, Australia, Central Europe, Malaysia, Singapore and Japan offer telecom operators a GPU-based edge computing platform without the need for capital expenditure, facilitating low latency and improved economics for value-added services and the monetization of 5G investments. 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 at scale. You will also leverage automation and AI-assisted tooling to improve detection, triage, and response across the platform security stack.

What You’Ll Do

Zero Trust Architecture 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. Identity Access Management 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, Certificate lifecycle automation. Infrastructure Platform Security Secure the underlying infrastructure used by the GPU cloud platform, including: Kubernetes clusters, Virtualization layers, 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. Network Security 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 InfiniBand environments. Security Automation 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.

Threat Detection Incident Response 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. Vulnerability Patch Management Design and maintain patch management strategies across the platform infrastructure, including: Operating systems, Container runtimes, Kernel updates, Infrastructure components.