{"id":2000331,"url":"https://alion.io/job/radianarc-sr-platform-security-engineer-zero-trust-and-platform-security","title":"Sr Platform Security Engineer (Zero Trust and Platform Security)","company":{"id":3908068,"name":"Radianarc","domain":"radianarc.com","url":"https://alion.io/company/radianarc","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"B","score":75,"open_postings":3,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-12T06:55:09Z"}},"role":"Security","role_family":"Security","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":95000,"max_usd":224000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":1891},"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"IAM","optional":false},{"name":"InfiniBand","optional":false},{"name":"Kubernetes","optional":false},{"name":"Least Privilege","optional":false},{"name":"LLM","optional":false},{"name":"LLM Guardrails","optional":false},{"name":"Machine Learning","optional":false},{"name":"PKI","optional":false},{"name":"Python","optional":false},{"name":"SIEM","optional":false},{"name":"Zero Trust","optional":false},{"name":"Authentik","optional":true},{"name":"Cortex","optional":true},{"name":"HashiCorp Boundary","optional":true},{"name":"HashiCorp Vault","optional":true},{"name":"Keycloak","optional":true},{"name":"Prometheus","optional":true},{"name":"Snort","optional":true},{"name":"TheHive","optional":true},{"name":"Wazuh","optional":true}],"status":"live","first_seen_at":"2026-05-22T17:52:32Z","employer_posted_date":"2026-10-01","last_verified_at":"2026-10-12T06:00:58Z","board_verified":true,"closed_at":null,"days_open":142,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":142},"description":"Location & work modality: Europe (remote)\nStart: ASAP\nType of Contract: Full-time (permanent or freeelance)\n\nAbout Radian Arc\nWe’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.\nWhat impact you will have\nDesign 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.\nThis 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.\nAs 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.\nWhat you’ll do\nZero Trust Architecture\nDesign and implement zero-trust security architecture across the platform.\nImplement identity-aware access controls for infrastructure, services, and operators.\nEnforce least-privilege access models for both internal teams and customers.\nSecure access paths to infrastructure components including:\nControl planes,\nOrchestration systems,\nManagement networks,\nOperational tooling.\nIdentity & Access Management\nDesign and operate secure authentication and authorization systems.\nImplement IAM capabilities for multi-tenant environments in collaboration with platform and infrastructure teams.\nIntegrate identity systems with infrastructure and platform components.\nManage cryptographic infrastructure including:\nPKI systems,\nKey management,\nCertificate lifecycle automation.\nInfrastructure & Platform Security\nSecure the underlying infrastructure used by the GPU cloud platform, including:\nKubernetes clusters,\nVirtualization layers,\nStorage systems,\nNetworking fabrics.\nCollaborate with infrastructure teams to ensure security is embedded in platform architecture and deployment practices.\nContribute to security guardrails and secure deployment patterns for new infrastructure.\nNetwork Security\nDesign and implement security controls for large-scale distributed infrastructure networks.\nImplement secure segmentation and tenant isolation mechanisms using technologies such as:\nEVPN / VXLAN,\nVRF isolation,\nEncrypted transport,\nZero-trust networking.\nWork with networking teams to secure high-performance fabrics including RDMA and InfiniBand environments.\nSecurity Automation\nDevelop automation workflows that improve detection, response, and remediation.\nBuild integrations between security systems and operational tooling.\nAutomate vulnerability triage, remediation workflows, and incident response processes.\nContribute to SOAR-style automation systems that coordinate security operations across the platform.\nThreat Detection & Incident Response\nSupport security monitoring and detection systems.\nInvestigate and triage security alerts and potential vulnerabilities.\nParticipate in incident response and post-incident analysis.\nImprove detection coverage and response automation across the platform.\nVulnerability & Patch Management\nDesign and maintain patch management strategies across the platform infrastructure, including:\nOperating systems,\nContainer runtimes,\nKernel updates,\nInfrastructure components.\nBuild automation pipelines that validate and deploy security updates across large infrastructure fleets.\nTrack vulnerabilities and coordinate remediation across engineering teams.\nMaintain vulnerability remediation workflows and reporting for security posture visibility.\nSecurity Telemetry & Detection\nBuild and maintain security monitoring pipelines that ingest signals from infrastructure, networking, and platform components.\nImprove signal quality from SIEM platforms by developing correlation rules, enrichment pipelines, and automated triage workflows.\nIntegrate security telemetry with platform observability systems to provide a unified view of infrastructure health and security posture.\nAI-Assisted Security Operations\nDesign and implement AI-assisted security workflows that analyze security telemetry and incident signals.\nDevelop AI agents that help:\nSummarize security alerts,\nCorrelate events across systems,\nDetect anomaly patterns,\nAssist operators during incident investigations.\nUse machine learning or LLM-based tooling to reduce alert fatigue and accelerate incident triage.\nCompliance & Security Governance\nHelp ensure platform security controls meet customer and regulatory requirements.\nContribute to security policies and operational procedures.\nHelp define measurable security metrics and compliance validation processes.\nTechnical Stack\nSecurity Monitoring & Detection\nWazuh.\nSnort IDS/IPS.\nTheHive.\nCortex.\nSecurity Infrastructure\nWazuh SIEM.\nHashiCorp Vault.\nHashiCorp Boundary.\nTailscale.\nIdentity & Access\nPKI infrastructure.\nIAM systems such as Authentik/KeyCloak.\nCertificate lifecycle management.\nIdentity federation.\nSecure Networking\nZero-trust networking models.\nEncrypted network transport.\nNetwork segmentation technologies\nCitrix NetScaler.\nPlatform Security\nKubernetes security.\nContainer runtime security.\nInfrastructure hardening.\nSecurity Automation\nPython / Go.\nSecurity automation frameworks.\nIncident response automation\nWhat you’ll need\nCore Experience\n7+ years of experience in cloud security or infrastructure security engineering.\nExperience securing large-scale distributed infrastructure platforms.\nInfrastructure Security\nStrong understanding of security architecture in cloud environments.\nExperience securing Kubernetes and containerized platforms.\nFamiliarity with multi-tenant infrastructure security models.\nIdentity & Cryptography\nExperience implementing identity and access management systems.\nStrong understanding of PKI, key management, and secure authentication systems.\nNetwork Security\nUnderstanding of datacenter networking security concepts.\nFamiliarity with segmentation, tenant isolation, and zero-trust networking.\nSecurity Operations\nExperience with SIEM platforms and security telemetry.\nAbility to triage vulnerabilities and investigate incidents.\nExperience building security automation workflows.\nWhat we offer\nAttractive compensation package reflecting your expertise and experience.\n\nA great work environment characterised by friendliness, international diversity, flexibility, and a hybrid-friendly approach.\n\nYou'll be part of a fast-growing scale-up with a mission to make a positive impact, offering an exciting career evolution.\n\nOur job titles may span more than one job level. The actual base pay is dependent on a number of factors, such as transferable skills, work experience, business needs and market demands.\nOur Inclusive Responsibility\nRadian Arc is committed to creating a diverse and inclusive environment and is proud to be an equal opportunity employer. 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