Offensive Security Lead

The Role\nWe're hiring an Offensive Security Lead to build and run Nebius' red team capability. You'll design and execute adversarial simulation across our cloud platform - attacking the same infrastructure our customers depend on - and translate findings into measurable security improvements. This is a hands-on leadership role within Product Security Team. You will build an internal red team, establish a penetration testing program, and conduct research to uncover sophisticated attack scenarios targeting high-value assets across the Nebius tech stack.\nWhat you’ll do\nBuild and lead a red team function within Product Security Team, hiring and developing offensive security engineers.\nValidate and extend early-stage Secure SDLC threat models via continuous penetration testing, assessing threat severity and mitigation status while challenging assumptions made during threat modeling and system development. Automate routine validations to keep pace with increasing feature flow, reserving manual analysis for genuinely complex cases.\nPlan and execute full-scoped red team engagements against Nebius cloud platform - including compute, storage, inference, networking, orchestration layers, and internal tooling. Identify threats, which are able to impact an organization's operations. Work closely with Detection & Response and other security engineering teams to run purple team exercises, validate detection coverage, and close gaps collaboratively.\nResearch novel attacks against GPU infrastructure (e.g., closed-source firmware and vendor driver binaries, device passthrough exploits, SR-IOV/IOMMU misconfigurations, RDMA/InfiniBand fabric attacks, etc.), the inference stack (e.g., vLLM, TRT-LLM), and AI platform managed services (e.g., managed Slurm). Assess tenant-isolation boundaries and how they can be broken at the low-level stack\nConduct targeted assessments of new products and infrastructure changes before they ship.\nDeliver clear, actionable reports for both technical audiences and leadership - with prioritized findings and remediation guidance.\nEstablish red team processes, tooling, and a methodology that scales as the platform grows.