Modal Labs • 📍 US / Americas Remote •
$190k - $260k USD
Optimize Linux cgroups v2 isolation, FUSE page-cache prefetching, and snapshot memory restoration across thousands of H100 nodes.
#firecracker • $199k-$250k USD Base
Firecracker in Production Rust: Architecture & Open Roles
Minimalist Rust KVM Virtual Machine Monitor (VMM) for microVMs
1. Why Teams Deploy Firecracker
Open-sourced by AWS in Rust to power AWS Lambda and Fargate, Firecracker (and the broader `rust-vmm` crate collection) stripped QEMU's legacy device emulation down to the bare minimum needed to boot modern Linux kernels. Today, Firecracker and `rust-vmm` power serverless GPU/AI code sandboxes at Modal, Fly.io Machines, Shuttle, and E2B.
2. Firecracker Kernel & Memory Internals
Firecracker interacts directly with the Linux kernel `/dev/kvm` ioctl API to configure vCPUs and guest physical memory slots, emulating only `virtio-net`, `virtio-block`, `virtio-vsock`, and a minimal serial console. To achieve sub-50ms warm starts for AI agents or serverless functions, platforms snapshot a running microVM's memory and restore it lazily across nodes using Linux `userfaultfd` page-fault handlers.
3. Firecracker Interview & Hiring Bar
Cloud compute and virtualization teams pay $195k to $280k for engineers skilled in KVM ioctls, `virtio` ring queues (`vhost-user`), `seccomp` syscall filters, and snapshot restore pipelines.
Open Firecracker Engineering Positions (5)
Oxide Computer Company • 📍 Worldwide Remote •
$275k - $275k USD
Debug PCIe/NVMe hardware emulation inside Propolis, write deterministic `no_std` drivers in Hubris, or scale distributed rack control planes.
AWS (Serverless Compute) • 📍 US / EU Remote •
$195k - $275k USD
Optimize virtio ring buffer throughput over `io_uring`, harden guest-to-host memory isolation, and reduce microVM snapshot restore tail latency.
Fly.io • 📍 Worldwide Remote •
$175k - $230k USD
Diagnose Linux kernel conntrack/netfilter edge cases, tune WireGuard mesh routing latency, and scale zero-downtime proxy reloads.
Shuttle • 📍 Europe / Worldwide Remote •
$160k - $210k USD
Speed up containerless Rust build pipelines, expand `shuttle-runtime` procedural macros, and manage multi-tenant network isolation.