Security Engineer, Network

Fluidstack

$100K — $150K *
US-AnywhereRemote in San Francisco, CA
Information Technology
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5-7 years of experience in network security at scale.
  • Proficient in reading packet captures and analyzing data flows.
  • Experience in designing segmentation for IT and OT environments.
  • Skilled in deploying NDR and flow-based detection systems.
  • Ability to work with infrastructure-as-code and maintain firewall rules in a repository.
  • Collaborative experience with network engineering teams.

Responsibilities

  • Design and defend network security architecture across various platforms.
  • Implement network detection telemetry and flow analysis across training and operational networks.
  • Enhance the security of physical plant interfaces with operational technology.
  • Automate network security controls for new site configurations.
  • Manage security measures for high-stakes computing environments.

Benefits

  • Work in a fast-paced, innovative environment focused on AI security.
  • Opportunity to build a security program from the ground up.
  • Autonomy to own projects end-to-end, impacting the organization's future.
  • Collaborative culture that values the best ideas over hierarchy.
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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