Security Engineer, Offensive Security

📋 Job Overview

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.

🏢 About Fluidstack

We exist to make humanity more free. For most of human history, you farmed or you starved. Technology gave people more time for the things they wanted to do, instead of things they had to do. Powerful AI will be the biggest lever for human choice we've ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who don't share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it. We're singularly focused on delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. We acquire power, design and build data centers, and operate them - with teams spanning hardware and software. Speed and scale are our key differentiators. Come be a part of building civilization-scale infrastructure for AI.

🎯 The Role

You're securing the frontier of AI. The model weights training on our infrastructure are the most valuable and most targeted artifacts in technology, and we're standing up the compute to hold them faster than anyone ever has. A breach isn't a leak, it's the frontier walking out the door. Build the entire security program from scratch. Most leaders inherit someone else's system and spend a career patching it. Here you own it end to end, bare metal to boardroom, as we scale across continents. Your threat surface is measured in gigawatts. The customers running on our infrastructure are building the most consequential technology in human history, and being responsible for the physical and logical security of that work makes everything else feel small.

✅ Key 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.

📌 Required Qualifications

• You have years of hands-on experience in red teaming and offensive security operations.
• You have deep expertise in at least two of: macOS, Linux, cloud (AWS, GCP, Azure), Kubernetes, CI/CD pipelines.
• You've found novel attack paths and chained vulnerabilities into full compromise.
• You've run adversary simulations against well-defended environments.
• You write quality code in Python, Go, or similar languages.
• You write findings that get fixed and help teams prioritize risk.
• You've worked closely with blue teams.

⭐ Desirable Experience

• 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.

🎁 Benefits

Compensation: $224K – $275K. Our compensation package includes base salary, equity for all full time roles, benefits, and, for applicable roles, commissions plans. Total compensation may also include equity in the form of restricted stock units.

🛂 Visa & Eligibility

Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.