See how candidates think and approach the work this role demands, before the phone screen. We'll build a video challenge from this posting, and you can edit or share it before it goes live.
Fal is treating multi-tenant GPU isolation, down to scrubbing GPU memory and device state between customers, as a core security problem, which suggests it is running untrusted third-party generative workloads on shared hardware at a scale where that risk now needs dedicated infrastructure security staff.
fal is the generative media ecosystem powering the next generation of AI products. We build the infrastructure, tools, and model access that teams need to move from idea to production, and do it at scale without compromise. For developers and enterprises, fal is the foundation that makes generative media not just possible, but practical: a unified platform where high-performance inference, orchestration, and observability come together to unlock new categories of AI-native products.
As generative media reshapes industries across a market projected to grow by hundreds of billions over the next decade, fal is becoming the ecosystem that ambitious teams build on.
We’re hiring a Senior Infrastructure Security Engineer to secure the foundation of fal.ai’s compute platform. You’ll own security below the application layer: the Linux kernel, the hypervisors and sandboxes that isolate workloads, GPU drivers and firmware, and the hosts that run them. You’ll harden the stack, strengthen isolation against untrusted code, and help make GPU compute safe at scale. Proficiency in building with and using AI is central to this role.
Secure Multi-Tenant Isolation
Build and maintain the threat model for running code on shared GPU hosts, from containers and microVM down to PCIe, IOMMU, and GPU passthrough
Design and verify GPU memory and device-state scrubbing between tenants
Help roll out hardware-backed isolation where it fits, including confidential computing and attestation
Harden the Stack
Harden kernel builds and host images: config minimization, LSMs, seccomp, namespace and cgroup policy, secure and measured boot
Reduce attack surface in GPU drivers, CUDA runtimes, NVLink/NVSwitch fabrics, BMC, and firmware
Assess and Research Vulnerabilities
Assess and triage security vulnerabilities in the kernel, hypervisors, GPU drivers, and firmware: judge exploitability and real impact on environment, set severity, and drive fixes or mitigations
Track vendor bulletins and upstream disclosures, and run kernel and driver patching that keeps pace without disrupting the fleet
Conduct vulnerability research on the components we depend on
Shape the Program
Contribute to the host and isolation security roadmap and evaluate tooling
Partner with Detection & Response on telemetry, and act as the escalation point for host, kernel, and driver incidents
Review designs from Infra, Platform, and ML teams, and help make the secure path the default
Work with GPU vendors, cloud providers, and upstream maintainers on disclosure and fixes
AI fluency: you use LLMs, agents, and AI coding tools daily to review code, build tooling, and accelerate vulnerability research
5+ years in systems or security engineering, with deep hands-on work in the Linux kernel, hypervisors, or device drivers
Fluent in kernel C, and comfortable in Rust, Go, or Python for tooling
Strong grasp of virtualization internals: KVM, VFIO, IOMMU/DMA protection, and the tradeoffs between containers, sandboxes, and microVMs
Has shipped hardening that runs in production at fleet scale
Has found, triaged, or fixed real vulnerabilities in low-level code and can explain the exploit path
Communicates risk clearly to different audiences, from kernel engineers to executives
NVIDIA GPU stack experience: open kernel modules, GSP firmware, MIG, vGPU, or GPU confidential computing
Confidential computing more broadly: AMD SEV-SNP, Intel TDX, attestation
Published CVEs, talks, or write-ups on kernel or hypervisor security
Prior work at a GPU cloud, hyperscaler, or chip vendor
Interesting and challenging work
A lot of learning and growth opportunities
We offer visa sponsorship and will help you relocate to San Francisco.
Health, dental, and vision insurance (US)
Regular team events and offsites
$180,000 - $250,000 + equity + comprehensive benefits package
U.S. EQUAL EMPLOYMENT OPPORTUNITY INFORMATION:
fal provides equal employment opportunities to applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, protected veteran status, disability, or any other classification protected by applicable law.
fal:d47e9698-cecf-4376-8791-d9c38c672712fal-aiThis posting hasn't been probed by our closure verifier yet. Stream C runs on a rolling schedule against postings approaching the close-decision threshold.
See how we measure for definitions, or our corrections log for known issues. Found something wrong? Flag a correction.