Network Security Engineer

Fluidstack

$120K — $150K *
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5-7 years of experience in large-scale network security or a related field.
  • Expertise in network segmentation, firewalls, and east-west traffic control.
  • Proficient in reading and analyzing packet captures and network telemetry.
  • Experience in deploying and tuning network detection tools for real-time threat identification.
  • Familiarity with infrastructure-as-code principles, particularly regarding firewall management.
  • Ability to collaborate with network engineering teams to balance security with operational needs.
  • Bonus experience in operational technology (OT) security and industrial control systems (ICS).

Responsibilities

  • Design network security architecture for data centers, corporate environments, and cloud infrastructures.
  • Implement network detection solutions, including telemetry and flow analysis across various networks.
  • Enhance security for operational technology and building management systems at scale.
  • Automate network security controls to ensure new sites adopt the standard architecture from day one.
  • Build and maintain a comprehensive security program from the ground up, suitable for a rapidly scaling organization.

Benefits

  • Opportunity to lead the development of a comprehensive security program from inception.
  • Work on securing one of the most valuable and targeted environments in technology.
  • Full autonomy and extreme ownership over projects and security architecture.
  • A fast-paced environment that encourages addressing challenges head-on and innovating continuously.
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.

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 [redacted] 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.

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