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.
#wireguard • $175k-$230k USD Base
WireGuard in Production Rust: Architecture & Open Roles
Encrypted mesh overlay networking with Noise protocol & ChaCha20-Poly1305
1. Why Teams Deploy WireGuard
WireGuard revolutionized VPN and overlay networking by replacing sprawling IPsec state machines with a fixed cryptographic suite (Noise_IK handshake, Curve25519, ChaCha20-Poly1305, BLAKE2s). Cloud platforms like Fly.io and zero-trust mesh networks like Tailscale and Firezone run user-space Rust WireGuard implementations (derived from Cloudflare's `boringtun`) to connect millions of nodes and microVMs.
2. WireGuard Kernel & Memory Internals
Achieving 10+ Gbps over a user-space WireGuard tunnel in Rust requires eliminating per-packet syscall overhead. Engineers batch packet reads and writes using `recvmmsg`/`sendmmsg` or `io_uring`, enable Linux UDP Generic Segmentation Offload (`UDP_SEGMENT`) and Generic Receive Offload (`UDP_GRO`), and coordinate ICE/STUN/DERP NAT traversal to establish direct peer-to-peer UDP paths.
3. WireGuard Interview & Hiring Bar
Mesh networking and cloud infrastructure teams hire Rust engineers who understand TUN/TAP virtual interfaces, MTU/MSS clamping, NAT hole-punching state machines, and SIMD crypto acceleration.
Open WireGuard Engineering Positions (3)
Tailscale • 📍 US / Canada / Remote •
$185k - $245k USD
Eliminate packet copies across TUN/socket boundaries, improve NAT hole-punching success rates on carrier-grade NATs, and write eBPF socket steers.
