Security Engineer, OT

📋 Job Overview

Application for Security Engineer, OT role at Fluidstack. We exist to make humanity more free by 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.

🏢 About Fluidstack

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.

✅ Key Responsibilities

• Threat model OT systems and environments across the fleet: SCADA platforms, BMS and EPMS, cooling and power systems, and the sensor networks that feed them.
• Design the architecture and segmentation that keeps a gigawatt-scale OT estate defensible: network zones, remote access paths, and the IT/OT boundary.
• Forward-deploy with controls engineering to secure operational deployments, from PLC code pipelines and virtualized controllers to the SCADA layer above them.
• Serve as the security consultant to power, controls, commissioning, and site teams as new capacity energizes, turning review requests into guidance teams can actually deploy.
• Work with the detection and response org to understand and tune OT-environment detection coverage, and respond alongside incident responders when attacks reach OT infrastructure.
• Lead engagements with hardware OEM’s on product security requirements and use cases such as firmware security, tamper evidence, and counterfeit detection to address supply chain risk.

📌 Required Qualifications

• You've secured substations, SCADA, or controls systems in production: Ignition or comparable platforms, PLCs, relays, and the industrial protocols beneath them.
• You've threat modeled OT environments and turned the results into segmentation and controls that operators could live with.
• You think in the Purdue Model and know when to break it, because virtualized PLCs and software-defined OT don't always fit the reference architecture.
• You've worked hands-on with common OT security tooling (Claroty, Nozomi, Dragos, or similar) and know what each class of tool can and can't see.
• You know BMS, EPMS, and cooling systems well enough to hold your own with the engineers who run them.
• You've moved security forward in engineering teams that don't report to you, through consultation and design review rather than mandate.

⭐ Desirable Experience

• NERC CIP or IEC 62443 depth.
• Securing virtualized or containerized industrial control.
• Commissioning-phase security work at construction sites.

🎁 Benefits

Our compensation package includes base salary ($275K – $344K), 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.