Head of Security Reliability

About Nebius:

Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure.

Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI.

Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D.

About the role

Nebius is looking for a Head of Security Reliability to establish and lead the Security Reliability pillar. Reporting directly to the CISO, this leader will be accountable for the ongoing effectiveness, resilience, and operational maturity of Nebius security products after implementation.

The role ensures that security platforms remain properly configured, maintained, integrated, monitored, adopted, and optimized to deliver measurable risk reduction. It also owns Nebius's Third-Party Risk Management (TPRM) program and the security-review process for new products, services, and technologies introduced across the company.

This is a hands-on leadership position for someone who combines security expertise, operational discipline, vendor-management experience, and a strong product mindset. The role partners closely with Security, IT, Engineering, Product, Procurement, Legal, Privacy, Compliance, and business stakeholders.

Key responsibilities

Security product reliability and lifecycle ownership

• Own security products and platforms after implementation, from operational handover through optimization, renewal, replacement, or retirement.

• Ensure security tools are correctly configured, maintained, integrated, monitored, and aligned with Nebius's risk profile and technical environment.

• Define ownership, service levels, operating procedures, support models, and escalation paths for every security platform.

• Monitor platform availability, data quality, control coverage, integration health, licensing, capacity, and performance.

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