Principal Security Engineer, Infrastructure Security

Security is at the foundation of OpenAI’s mission to ensure that artificial general intelligence benefits all of humanity. The Security team protects OpenAI’s technology, people, and products. OpenAI is seeking a Principal Security Engineer to join our Infrastructure Security (InfraSec) team. InfraSec protects the foundations of OpenAI’s research and production environments, spanning GPU supercomputing clusters, multi-cloud infrastructure, datacenters, networking, storage, and the critical services that power our frontier AI models.

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.