Network Security Engineer

Fluidstack

$100K — $140K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5-7 years experience in securing production networks at scale
  • Proficient in analyzing packet captures and network data
  • Skilled in designing segmentation for mixed IT and OT environments
  • Experienced in deploying and tuning network detection and response systems
  • Familiar with infrastructure-as-code for managing firewall rules
  • Collaborated effectively with network engineering teams
  • Bonus: Knowledge in OT/ICS security and BGP/routing security.

Responsibilities

  • Design network security architecture across data centers and cloud environments
  • Implement and manage segmentation, firewalls, and east-west controls
  • Develop network detection telemetry and alerting systems
  • Enhance security of operational technology and building management systems
  • Automate security processes to ensure consistency at new sites
  • Establish a comprehensive security program from the ground up
  • Analyze threats across a vast network scale.

Benefits

  • Full autonomy and ownership of projects
  • Opportunity to work on cutting-edge AI security challenges
  • Fast-paced work environment driving innovation
  • Collaboration across multiple teams and departments
  • A culture of challenging assumptions and ideas with merit.
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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