Senior Infrastructure Security Engineer

fal•San Francisco, CA

1d•$180,000 - $250,000

About The Position

fal is hiring a Senior Infrastructure Security Engineer to secure the foundation of fal.ai’s compute platform. The role focuses on security below the application layer, including the Linux kernel, hypervisors and sandboxes that isolate workloads, GPU drivers and firmware, and the hosts that run them. The engineer will 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 the role.

Requirements

Use LLMs, agents, and AI coding tools daily to review code, build tooling, and accelerate vulnerability research.
At least 5 years in systems or security engineering, with deep hands-on work in the Linux kernel, hypervisors, or device drivers.
Fluency in kernel C and comfort with Rust, Go, or Python for tooling.
Strong grasp of virtualization internals, including KVM, VFIO, IOMMU/DMA protection, and tradeoffs between containers, sandboxes, and microVMs.
Experience shipping hardening that runs in production at fleet scale.
Experience finding, triaging, or fixing real vulnerabilities in low-level code, with the ability to explain the exploit path.
Ability to communicate risk clearly to audiences ranging from kernel engineers to executives.

Nice To Haves

NVIDIA GPU stack experience, including open kernel modules, GSP firmware, MIG, vGPU, or GPU confidential computing.
Broader confidential computing experience, including AMD SEV-SNP, Intel TDX, or attestation.
Published CVEs, talks, or write-ups on kernel or hypervisor security.
Prior work at a GPU cloud, hyperscaler, or chip vendor.

Responsibilities

Build and maintain the threat model for running code on shared GPU hosts, from containers and microVMs 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 appropriate, including confidential computing and attestation.
Harden kernel builds and host images through configuration minimization, LSMs, seccomp, namespace and cgroup policy, and secure and measured boot.
Reduce attack surface in GPU drivers, CUDA runtimes, NVLink/NVSwitch fabrics, BMC, and firmware.
Assess and triage vulnerabilities in the kernel, hypervisors, GPU drivers, and firmware; judge exploitability and impact, 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 the company depends on.
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.