Network Security Engineer

Fluidstack

$90K — $130K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5+ years securing production networks at scale
  • Experience designing segmentation for IT and OT environments
  • Proficient in network detection and response (NDR) technologies
  • Familiarity with infrastructure-as-code for network security
  • Ability to collaborate with network engineering teams
  • Bonus: expertise in OT/ICS security, data center/cloud environments

Responsibilities

  • Design and implement network security architecture across multiple environments
  • Build and maintain network detection systems for telemetry and alerting
  • Enhance security for Operational Technology (OT) and Building Management Systems (BMS)
  • Automate security controls for seamless integration of new sites
  • Analyze threat patterns and respond to security incidents
  • Ensure continuous improvement of network security protocols

Benefits

  • Full autonomy and ownership of projects
  • Fast-paced environment with emphasis on delivering results
  • Collaborative culture that values the best ideas over hierarchy
  • Opportunity to work on groundbreaking AI security challenges
  • Flexible approach to responsibilities, encouraging adaptation and growth
Full Job Description
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
  • 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.
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.
  • 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.


We are committed to pay equity and transparency.

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