• Debug and optimize network performance end-to-end: NIC tuning, congestion control, packet pacing, queueing disciplines • Analyze traffic using tcpdump, Wireshark, and custom tooling; reason about protocol behavior under load • Work with protocols beyond TCP/UDP when required (e.g., ICMP, IGMP, multicast) • Experience with high-performance I/O and kernel-bypass techniques such as DPDK, XDP, io_uring, or similar • Read and reason about Linux kernel source when debugging requires it • Understand networking stack internals (socket buffers, congestion control, netfilter, scheduling interactions) • Build bespoke tooling when existing observability is insufficient • Work fluently with kernel interfaces used by performance-sensitive systems • Use hardware performance counters, perf, eBPF, and flamegraphs to locate real bottlenecks • Reason about practical CPU behavior: cacheline contention, branch misprediction, NUMA effects, memory ordering • Understand IRQ affinity, scheduling behavior, paging, and TLB effects under real workloads • Strong low-level systems programming background • We work primarily in Rust, but strong experience in C or C++ is equally relevant • Solid understanding of algorithms, data structures, and writing correct concurrent code • Contribute to infrastructure, tooling, and occasionally upstream projects