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Added 3 mins ago
GL
Data Center Logistics Associate - 1st Shift
GXO Logistics
Bristow, VA
- $21 USD / hour
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 3 mins ago
GL
Data Center Logistics Associate - 1st Shift
GXO Logistics
Bristow, VA
- $21 USD / hour
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 3 mins ago
GL
Data Center Logistics Associate - 1st Shift
GXO Logistics
Bristow, VA
- $21 USD / hour
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 3 mins ago
Data Center Logistics Associate - 2nd Shift
GXO Logistics
Midlothian, TX
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 3 mins ago
GL
Data Center Logistics Associate - Weekend 3rd Shift
GXO Logistics
Bristow, VA
- $21 USD / hour
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 4 mins ago
Network Engineer
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Maintain and update network systems as needed with software and firmware updates.
Added 8 mins ago
Senior Chief Engineer
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Electrical distribution equipment such as: Emergency Generators, HV/MV/LV switchgears, Uninterruptible Power Systems (UPS), Battery Energy Storage Uninterruptible Power Supplies (BESSUPS),…
Added 9 mins ago
O
Senior Network Services Engineer
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- $83,000 to $166,100 USD / year
…tasks, as well as create and customize dashboards, telemetry systems, and alerting mechanisms to monitor network…
Added 10 mins ago
Senior Network Engineer
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Fort Collins, CO
The Senior Network Engineer is responsible for leading the design, deployment, implementation, and lifecycle management of complex network infrastructure systems. Oversees advanced network…
Added 11 mins ago
Sr. Manufacturing Test Engineer, AWS Rack Mfg Operations
Amazon Data Services, Inc.
Hebron, KY
We are seeking a Manufacturing Test Engineer to support final assembly and test (FA&T) operations for enterprise-class hardware products - including servers, storage systems, network…
Added 11 mins ago
Data Center Chief Engineer, Night Shift, ATL DCEO
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Covington, GA
The Data Center Chief Engineer (CE) is responsible for ensuring that all electrical, mechanical, and fire/life safety equipment within the data center is operating at peak efficiency. This…
Added 14 mins ago
Field Service Engineer I
Thermo Fisher Scientific
Remote, United States
The Field Service Engineer performs customer installs, repairs, qualifications, and preventative maintenance on a variety of ThermoFisher instruments within an assigned territory. Customers…
Added 14 mins ago
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Added 15 mins ago
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AM General develops and builds specialized ground vehicle systems that get the US Armed Services and our allies to and from their mission safely. Our innovative spirit delivers advanced,…
Added 22 mins ago
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Added 23 mins ago
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Director of Intelligent Transportation Systems (Civil Engineer VI) – 3 employees.
Added 28 mins ago
Senior GNC Engineer
SpaceWorks Enterprises
Atlanta, GA
At SpaceWorks Enterprises, we specialize in next-generation high-speed flight systems, human and robotic spacecraft, as well as entry, descent & landing technologies. Our core competencies…
Added 28 mins ago
F
Platform Security Engineer
Fly.io
Remote, United States
- $180,000 to $225,000 USD / year
You're comfortable being the technical authority on low-level work without a more senior security engineer above you.
Added 30 mins ago
Senior Software Engineer
Pearson
Remote, United States
…teams, and this role is for a senior individual contributor engineer who will work side-by-side with Product Management, UX, and other engineers to turn product strategy into reliable,…
Added 30 mins ago
Hybrid South Carolina Cloud Engineer – Managed IT Services (5117)
SMX
Columbia, SC · Hollywood, MD
We are looking for a skilled Cloud Engineer to join our State and Local Platforms and Data Managed Services team. As a core member of our operations group, you will work across multiple…
Added 31 mins ago
Staff Machine Learning Engineer, Model Platform
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We're hiring a Staff Machine Learning Engineer with deep Java backend experience to set the technical direction for how our models and services work together. You'll define how every team…
Added 35 mins ago
Electrical Architecture Engineer
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Troy, MI
Cross-Functional Systems Integration: Partner with Systems Integration, Propulsion Integration, Vehicle Integration & Validation, Manufacturing, Quality, and Program Management teams to…
Added 35 mins ago
Data Center Logistics Associate - 1st Shift
GXO Logistics
Moncks Corner, SC
Familiarity with inventory management systems and software, as well as proficiency in using basic office software (e.g., Microsoft Excel, Word)
Added 35 mins ago
A
Principal Systems Engineer
Actalent
Syracuse, NY
- $120,000 to $175,000 USD / year
Job Title: Thermal Systems EngineerJob DescriptionJoin our Innovation Center of Excellence, where you'll have the opportunity to drive the development of intelligent Climate and Energy…
Added 39 mins ago
Information System Security Officer - Topsecret
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…Acquisition Executive managed service provider contract. This mid-level role requires a highly autonomous, TOP SECRET-cleared cybersecurity professional who will serve as the cybersecurity…

Fly.io

Platform Security Engineer

Remote, United States

$180,000 to $225,000 USD / year

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Job details

Pay: $180,000 to $225,000 USD / year
Posting language: English
Posted: Nov 5, 2026

Original job description

About Fly.io

We're building a public cloud that runs on our own hardware all over the world. Customers hand us containers; we convert them into micro-VMs under hardware virtualization, each with its own kernel, on thousands of bare-metal hosts we operate ourselves. A growing share of those workloads are AI agents and inference, which means a growing share of the people attacking cloud platforms are interested in us.

Isolation is the product. The boundary between one customer's workload and the next, and between any workload and our own control plane, is a stack of things we build and run: the VMMs and their jailers, seccomp filters, host networking rules, the identity each host presents to the rest of the fleet, and the custom kernel underneath all of it. When that boundary holds, nobody notices. That's the job.

The Role

We have a security team. It covers application security, trust boundaries and auth, vulnerability research against our own hypervisor stack, corporate security, compliance, and disclosure. What it doesn't have is someone who works alongside the platform team hacking on the platform itself: the kernel, the hypervisor jailers, the syscall filters, host network isolation, and the trust relationships between hosts. That's the gap this role closes.

The work has two halves, and you will own both:

• Keep the guest in the VM. Harden the per-workload boundary on every host.

• Plan for the worst. Limit the blast radius for when the next horrible KVM guest-to-host escape drops.

You will report to the Head of Security, who will set your priorities and review your work, but you will spend most of your day with the Platform team, who own the systems you will be changing. Coordination and communication will be just as important as raw technical skills.

What You'll Be Doing

Isolation and sandboxing. We run two VMMs, Firecracker and Cloud Hypervisor, with jailers around them. You will own the syscall filtering, the process-level confinement, the network confinement around the jailers, and the violation telemetry that feeds our detection pipeline, across both VMMs and the host services that make up the platform.

Host network isolation. A lot of our fleet's isolation rests on nftables and friends. You will own what each host is allowed to talk to, by role, and the health checks and killswitches that tell us the rules in force are the ones we intended.

Blast radius and control-plane trust. The second half of the job. You will own the trust model between hosts and the control plane: how a host identifies itself and how its actions are attributed, how host-to-host operations such as machine migration are authorized, which services run on hosts that also run customer workloads, and what credentials live on a host and what each one can reach. You will design this with the Platform and Networking teams, build the host-local pieces yourself, and verify the rest.

The kernel. We build and patch our own host kernel. You will own the patching cadence and its SLA, keep kernel expertise spread across the fleet team rather than concentrated in one person, and own live kernel patching for the fixes that cannot wait for a reboot cycle.

Agent workloads. The platform increasingly runs agents, including a sandbox product for them. You will take the isolation half of that design seat: VMM confinement, worker-side controls, and what the platform can honestly guarantee an agent workload. This may even include compute where we no longer own the metal, and we will need to design for a fleet that spans trust levels.

When it breaks. A suspected guest escape, a host behaving strangely, weird kernel behavior: these need someone who can lead the technical investigation on the host, not just coordinate it. You will be one of the names we call, and you will help strengthen our forensics playbook.

You will want to be comfortable working with coding agents. We lean on them hard, and the honest truth of low-level security work is that an agent will confidently hand you a kernel patch that is subtly wrong. You will need to be the person who catches it.

Who We're Looking For

• You've shipped non-trivial Linux kernel, KVM or hypervisor, or BPF security work in production.

• You have production experience with seccomp filters, jailer or sandbox configuration, or VM isolation hardening.

• You have one anchoring domain (kernel and sandboxing, or host networking) with credible reach into the others. You will ramp across the rest over 6 to 12 months.

• You've run hardware virtualization on hardware you didn't control: bare-metal cloud instances, nested virtualization, or hosts in a customer's account. Not required, but definitely nice-to-have.

• You've been the platform-security specialist on a security team before, and you've shipped security work in a matrixed org by collaboration rather than authority.

• You're comfortable being the technical authority on low-level work without a more senior security engineer above you.

• You write well asynchronously. Most of Fly happens in Slack threads and written design discussions.

This is not an application-security role. If your background is primarily SAST, code review, or web app pentesting, we already have that lane covered.

Other Important Things to Know We don't want to sell you a bill of goods. A few things about this role are genuinely hard:

• You will be the depth. Nobody in the security function can backstop you on kernel, syscalls, BPF, or network isolation. Your technical sparring partners are our vulnerability researcher and the Platform and Networking teams, and those are relationships you will build.

• Much of the work lives in systems other teams own. You will change code in the platform and networking repositories, and those teams are busy. Getting things shipped depends on collaboration and clear writing more than on org-chart authority. The reporting line is designed to protect your priorities, not to let you dictate theirs.

• The scope is real and the structure is thin. There's no backlog handed to you. Work surfaces from incidents, from Slack, from the fleet. You will manage your own scope, and that is harder than it looks.

• We're on call, and our stuff is global. When isolation breaks, customers notice, in every time zone.

Extrapolate the bad implications, then ask us about them, and we'll be candid.

Our Process for Hiring

This is a senior, fully-remote, full-time position. We offer competitive equity grants with a long exercise window, health care benefits, flexible vacation time (with a minimum), and hardware and phone allowances.

We respect career experience but we aren't hypnotized by it, and we don't trust resumes or interviews to tell us who can do this work. Instead we show you the kind of work we actually do and see if you enjoy doing it. The process is about five hours of your time end to end:

• Short written application. A few questions about your background and how you work.

• Work sample (async, 2 to 3 hours). A kernel live patch for a recent CVE on a preconfigured environment we give you, a short critique of an AI-generated attempt at the same patch, and a paragraph on how you used AI tooling along the way.

Phone Screen - 15-20 min HR Phone Screen

• Workday (live, 2 hours). You and one of our platform engineers will work a host-isolation scenario together over Slack. Coding agents are welcome; we want to see how you drive one.

• Final (30 minutes). A conversation with our CEO.

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More about this job

Skills

Research
Regulatory compliance
Communication skills
Linux
Collaboration
Penetration testing
Reporting

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