Security Engineer, Offensive Security

About This Role

This Security Engineer role focuses on offensive security, building and leading the program from the ground up. The position involves running red and purple team operations, pen testing critical systems, and partnering with engineering teams on AI-specific attack scenarios. It suits a candidate with deep hands-on experience in offensive security who can present findings to technical and executive audiences.

Responsibilities

• Build Fluidstack's offensive security program from the ground up, including its methodology, tooling, and engagement cadence
• Run red and purple team operations emulating advanced threat actors across our cloud infrastructure, endpoints and bare metal deployments
• Pen test critical systems, including tenant isolation, bare metal GPU hosts, firmware and BMCs, and data center OT
• Partner with security and engineering teams on AI-specific attack scenarios, including agentic systems and other novel AI-enabled risks
• Contribute to AI-assisted offensive testing tools and workflows
• Present findings to technical and executive audiences as clear, actionable risk that shapes the security roadmap
• Live on the bleeding edge of AI-enabled offensive operations inside and outside our environments

Requirements

• Years of hands-on experience in red teaming and offensive security operations
• Deep expertise in at least two of: macOS, Linux, cloud (AWS, GCP, Azure), Kubernetes, CI/CD pipelines
• Found novel attack paths and chained vulnerabilities into full compromise
• Run adversary simulations against well-defended environments
• Write quality code in Python, Go, or similar languages
• Write findings that get fixed and help teams prioritize risk
• Worked closely with blue teams

Nice to have:

• State-nexus threat models (frontier AI, government, critical infrastructure)
• Testing AI and ML systems (agentic workflows, model serving)
• Defensive experience (detection engineering, SIEM, EDR)
• Hardware and data center attacks (firmware, BMC, OT/ICS)
• Interest in AI safety and security

About the Company

Fluidstack exists to make humanity more free by delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. They acquire power, design and build data centers, and operate them with teams spanning hardware and software, singularly focused on building civilization-scale infrastructure for AI.