Security Engineer, Threat Detection

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.

We hire people who care deeply about this problem space. If that is you, please apply!

How We Operate

• Be a barrel. Full autonomy. Own things end to end, take on scope without being asked, no permission required to operate outside your core role.

• Insane urgency. We drive everything forward as fast as possible.

• Reason from first principles. Challenge every assumption. Zero analogy thinking, no egos, the best idea wins.

• Love of the game. The frontier of AI is the most interesting problem of our time. We put in long hours at high intensity to push the frontier forward.

• Build something that actually matters. If you're going to spend your time, spend it on something that matters to the world.

The Security & Corp IT Team

The Security & Corp IT team protects the people, systems, and infrastructure behind the largest AI compute buildout in history.

Examples of key problems the team is working on:

• Build detection and response coverage across cloud (AWS/GCP/Azure), endpoint, and identity telemetry for a company whose attack surface spans corporate IT and gigawatt-scale data center infrastructure.

• Run incident response end to end, from first alert through containment, remediation, and postmortem, without a large SOC to fall back on.

• Stand up detection-as-code pipelines so every detection is versioned, tested, and deployed like software rather than hand-edited in a console.

• Harden corp IT foundations (identity, device management, access) so security scales with headcount instead of lagging it.

Role Scope

• Build the detection engineering function from the ground up: telemetry pipelines, detection content, alert routing, and response runbooks, with coverage you can defend against a threat model, not just a tool checklist.

• Own detection-as-code end to end, writing detections across cloud and endpoint sources with tests, version control, and CI so a bad rule never ships silently.

• Lead incident response for high-severity events, driving containment and root cause, and closing out each incident with detections that catch the same class of attack next time.

• Drive automation of triage and enrichment in Python (or similar) so alert volume scales without proportional headcount.

• Partner directly with leadership on security strategy, translating threat landscape and detection gaps into a prioritized roadmap with clear tradeoffs.

• Work across corp IT and infrastructure teams to get the telemetry, logging, and access you need, and to fix the root causes your detections keep surfacing.

What We're Looking For

The below is a starting point. We always make space for exceptional people, so if you don't fit this role exactly, tell us where you would.

• 8+ years in security operations, detection engineering, or incident response, with time spent at a high-growth tech company, cloud-native infrastructure provider, or top-tier MDR/threat intel firm.

• You've built or scaled a detection engineering function, not just operated inside one: you can point to the program, the pipeline, and the coverage that exist because of you.

• Deep hands-on experience writing detections against cloud telemetry (AWS, GCP, or Azure control plane and audit logs) and endpoint telemetry (EDR event streams, OS-level signals).

• Strong scripting and automation skills in Python or similar, enough to build and maintain detection-as-code pipelines yourself rather than spec them for someone else.

• Incident response experience at a company operating at significant scale, where you led response under pressure and your postmortems changed how the company operates.

• You operate as a technical lead without heavy management overhead: you set direction, make the calls, and do the work.

• You work well across corp IT and infrastructure teams in a fast-moving environment, and you get telemetry and fixes shipped by making the case, not by escalating.

• Bonus: experience securing GPU clusters, HPC environments, or physical data center infrastructure, or contributions to open-source detection content (Sigma, community rule sets).

Physical Requirements

• Work in non-climate-controlled environments, including active construction areas, data halls, electrical and mechanical rooms, and outdoor spaces. Temperatures can be high or low, and conditions can be humid, loud or dusty.

• Lift, carry, push and pull up to 40 pounds on your own.

• Sit, stand, walk, kneel, bend and crouch for long periods, including full shifts on your feet.

• Wear the required personal protective equipment (PPE), such as hard hats, safety glasses, steel-toed boots, gloves and hearing protection, and follow site safety rules.

• Climb stairs and ladders, and move around equipment, cable trays and uneven surfaces.

We are committed to pay equity and transparency.

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.

You will receive a confirmation email once your application has successfully been accepted. If there is an error with your submission and you did not receive a confirmation email, please email View email address on aiapply.co with your resume/CV, the role you've applied for, and the date you submitted your application-- someone from our recruiting team will be in touch.