Network Engineer, Security

About the role

Fluidstack exists 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.

Responsibilities

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 – 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 – spend your time on something that matters to the world.

Role Scope: Design and defend the network security architecture across data centers, corp, and cloud: segmentation, firewalls, and east-west controls at gigawatt scale. Build network detection: telemetry, flow analysis, and alerting across training fabrics, OT networks, and the WAN. Harden the OT and BMS side, where the network touches physical plant, against threats most security teams never see. Automate network security controls so new sites inherit the architecture on day one.

Requirements

• You've secured production networks at scale, and you read a packet capture as comfortably as a dashboard.
• You've designed segmentation for environments that mix IT, OT, and high-value compute.
• You've deployed and tuned NDR or flow-based detection that found real intrusions.
• You work infrastructure-as-code: your firewall rules live in a repo, not a GUI.
• You've partnered with network engineering without becoming the department of no.
• Bonus: OT and ICS security. Data center or cloud provider environments. BGP and routing security. Zeek or Suricata.

Pay

Compensation Range: $162K - $202K