Principal Security Engineer, Infrastructure Security

OpenAI is an AI research and deployment company dedicated to ensuring that general-purpose artificial intelligence benefits all of humanity. The Principal Security Engineer will set technical direction and drive high-impact infrastructure security programs across GPU clusters, multi-cloud infrastructure, datacenters, networking, storage, Kubernetes, and critical services. The role will design security controls, lead cross-functional initiatives, conduct threat modeling, and mentor engineers across Infrastructure Security and partner teams.

Responsibilities:

• Own end-to-end security outcomes for one or more critical infrastructure areas, including multi-quarter strategy, roadmap, and delivery
• Design and build security controls across diverse layers (e.g., physical hardware, firmware/BMC, OS, Kubernetes, networks, and CI/CD) to defend against sophisticated adversaries and insider threats
• Lead cross-functional programs to deploy security enhancements and control changes across broad-scale infrastructure, balancing security guarantees with reliability and velocity
• Take a generalist approach to building security controls, balancing a mix of security expertise and broad technical skillsets to adapt to evolving challenges
• Lead and/or drive threat modeling and design reviews for major infrastructure changes, ensuring strong security foundations and operational excellence
• Mentor and level up engineers across InfraSec and partner teams, contributing to a strong security culture through guidance, reviews, and technical leadership

Requirements:

• Deep understanding of security principles, best practices, and common vulnerabilities, including strong security judgment under ambiguity
• A proactive mindset, with the ability to identify and address security gaps or inefficiencies through automation and tooling
• Expertise and curiosity about using frontier models and agents to effectively solve security challenges
• A track record of leading large, cross-org initiatives from concept to rollout, including navigating tradeoffs, driving alignment, and delivering measurable risk reduction
• Deep expertise in the security of cloud platforms (e.g., Amazon AWS, Microsoft Azure), especially securing multi-cloud networks and infrastructure, and designing cloud-agnostic systems
• Experience securing on-prem deployments and datacenters from construction to multi-tenant use
• Familiarity with container security, orchestration security, and authentication/authorization
• Strong analytical and problem-solving skills, with an ability to think critically and objectively assess security risks
• Excellent communication skills, with the ability to convey complex security concepts to executive, technical, and non-technical stakeholders
• Excitement about collaborating with cross-functional teams to build secure, reliable systems that scale globally