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Added 1 min ago
Software Engineer - Front-End Web Applications
National Radio Astronomy Observatory
GREEN BANK, WV · CHARLOTTESVILLE, VA · SOCORRO, NM
…with these telescopes. We are seeking a mid-level Software Engineer with strong front-end web development skills to join the Archive Team, part of the Science User Applications Group (SUA).…
Added 1 min ago
Software Engineer - Test and Quality
National Radio Astronomy Observatory
GREEN BANK, WV · CHARLOTTESVILLE, VA · SOCORRO, NM
…with these telescopes. We are seeking a mid-level Software Engineer with strong software testing experience to join the Science User Applications Group (SUA). SUA builds some of the…
Added 1 min ago
Senior Geotechnical Engineer
QUALITY TESTING LLC
Gilbert, AZ
As a Senior Geotechnical Engineer, you will lead geotechnical investigations and provide technical guidance throughout the planning, design, and construction phases of projects.
Added 1 min ago
Senior Project Manager/Technical Lead, Conveyance - New England
Stantec
Burlington, MA · Amherst, MA · South Burlington, VT · Northampton, MA · Auburn, NH · Providence, RI · Hartford, CT · Hingham, MA · Portland, ME · Boston, MA
…within the community. In this role, you’ll lead the planning, design and delivery of urban storm drain, combined and sanitary sewer, and drinking water conveyance projects principally for…
Added 2 mins ago
Partner Technology Architect - Autonomous Workforce
ServiceNow
Remote, United States
It all started when engineer Fred Luddy wrote code that automated a tedious task for his coworker, Phyllis. She cried tears of joy. That moment inspired Fred to build a company that could…
Added 2 mins ago
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Head of Platform & Infrastructure Engineering
Ashby
Remote, United States
- $340,000 to $400,000 USD / year
- Assessing and improving our monitoring and incident management process. Again, we’re doing relatively well here, but there’s always room to improve. For example, making uptime measurement…
Added 3 mins ago
Process Engineer
Revlon Corporate
Oxford, NC
A Manufacturing Process Engineer designs, implements, monitors, and improves manufacturing processes in a regulated GMP environment. This role focuses on improving efficiency, maintaining…
Added 3 mins ago
RE
Senior Staff, Customer Quality Engineering (CQE)
Renesas Electronics
San Jose, CA
- $159,000 to $198,000 USD / year
Renesas Electronics is looking for a Senior Staff Quality Engineer to serve as the customer-facing quality lead for top-tier hyperscale datacenter and cloud customers. The role will drive…
Added 4 mins ago
High Voltage Battery Thermal CAE Engineer
Ford Global
Dearborn, MI
Post process and report thermal simulation results to product development teams to guide battery design in support of product development milestones.
Added 4 mins ago
Product Development Engineer - Systems Engineering
Ford Global
Dearborn, MI
Analyze customer feedback on system or component performance and identify improvements (design and process) and implement prevent reoccurrence.
Added 5 mins ago
Business R&D Experienced Professional
HITACHI ENERGY USA INC
Alamo, TN
Are you ready to shape the future of high-voltage technology? Join Hitachi Energy as a Senior Mechanical Design Engineer and play a key role in developing innovative bushings and…
Added 5 mins ago
Senior Software Engineer
Noblis
San Diego, CA
Noblis MSD is seeking a Senior Software Engineer to for our NIWC team. The selected individual will work on our Integration engineering team supporting NIWC Pacific in the software…
Added 5 mins ago
Commissioning Agent
HDR
Phoenix, AZ
…commissioning of building engineering services from the earliest design stages through to the completion of complex integrated test procedures. We address each step of the process through a…
Added 6 mins ago
Quality Engineer
RocketForce Technologies LLC
Mason, OH
As a Quality Engineer, you will support product quality, program execution, and continuous improvement across engineering and manufacturing. You will use data-driven methods to develop,…
Added 7 mins ago
Manufacturing Engineer
Airxcel Inc
Elkhart, IN
The Manufacturing Engineer is responsible for creating and modifying detailed engineering drawings and models using SolidWorks, developing manufacturing processes, and providing technical…
Added 7 mins ago
Sr Software Engineer
O'Reilly Technology Services, Inc.
Remote, United States
The Sr Software Engineer operates with a high degree of independence and leverages multiple functional and technology skillsets to design, develop, test, and implement resilient software…
Added 7 mins ago
Mechanical Design Engineer
System One
Houston, TX
We are seeking a Mechanical Design Engineer to join our client's engineering team in North Houston. This role focuses on designing custom mechanical systems and supporting products from…
Added 7 mins ago
Network Deployment Engineer- Remote with paid travel
System One
Phoenix, AZ
Design, deploy, configure and administer complex network environments across multiple geographic locations.
Added 7 mins ago
SO
Engineer
System One
Boston, MA
- $58 to $68.25 USD / hour
Support the design, manufacturing and characterization of lipid nanoparticles (LNPs) for screening critical process parameters (CPPs) and critical material attributes (CMAs) that impact…
Added 7 mins ago
Design Release Engineer - Hard Trim
ALTEN Technology USA
Auburn Hills, MI · Troy, MI
The Interior Lighting Design and Release Engineer (DRE) – Advanced is responsible for the design, development, and release of ambient, functional, and decorative interior lighting systems.…
Added 9 mins ago
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Looking for Process Engineer
GPAC
Canaan, CT
- $90,000 to $115,000 USD / year
We're looking for a Process Engineer to own and improve our injection molding and secondary manufacturing processes in a regulated medical device environment. You'll make sure our processes…
Added 9 mins ago
G
Looking for Process Engineer
GPAC
Collinsville, CT
- $90,000 to $115,000 USD / year
We're looking for a Process Engineer to own and improve our injection molding and secondary manufacturing processes in a regulated medical device environment. You'll make sure our processes…
Added 9 mins ago
G
Looking for Process Engineer
GPAC
Bethlehem, CT
- $90,000 to $115,000 USD / year
We're looking for a Process Engineer to own and improve our injection molding and secondary manufacturing processes in a regulated medical device environment. You'll make sure our processes…
Added 9 mins ago
Staff Robotics Software Engineer, CUAS, Omen
Anduril Industries
Costa Mesa, CA
Small drones are hard to hit. Hitting them from a moving aircraft is harder. We need a Staff Software Engineer to own software integration of Omen’s airborne counter-UAS effector payload…
Added 9 mins ago
Staff Electrical Integration Engineer, Air Dominance and Strike
Anduril Industries
Costa Mesa, CA
…end-to-end development, from system architecture and circuit design to verification, integration, and flight test, ensuring scalable, mission-ready solutions that meet the performance,…

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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