Security Engineer, Cloud

Job Overview

Fluidstack is seeking a Security Engineer, Cloud to join our team. 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.

How We Operate

Extreme ownership. Full autonomy. Own things end to end often taking on scope outside your core role without being asked to get things done.

Velocity. We drive everything forward as fast as possible.

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.

The Security Team

Examples of key problems the team is working on:

• 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.

Role Scope

Own security for the cloud and bare-metal control planes customers' training runs depend on: hardening, identity, and workload isolation.

Build guardrails as code: policies, scanning, and paved roads that make the secure path the fast path for engineers.

Engineer detection and response across cloud infrastructure, from API abuse to compromised credentials to tenant escape.

Secure the multi-tenant boundary where customer workloads, some of the most targeted in AI, share infrastructure.

What We're Looking For

You've secured production cloud or bare-metal infrastructure hands-on, not just audited it.

You've shipped security tooling engineers actually adopted.

You've found and fixed real isolation or privilege-escalation issues.

You write production-quality code and treat policies as software.

You've run incident response on infrastructure you helped build.

Bonus: Kubernetes and container security. Hardware root of trust and measured boot. eBPF-based detection. GPU and HPC environments.

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.