Fastly helps people stay better connected with the things they love. Fastly’s edge cloud platform enables customers to create great digital experiences quickly, securely, and reliably by processing, serving, and securing our customers’ applications as close to their end-users as possible — at the edge of the Internet. The platform is designed to take advantage of the modern internet, to be programmable, and to support agile software development. Fastly’s customers include many of the world’s most prominent companies, including Git Hub, Yelp, Paramount, and Jet Blue.
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Posting Open Date: 10/07/2026Anticipated Posting Close Date*: 11/6/26*Job posting may close early due to the volume of applicants.
Staff Software Engineer, Linux Edge KernelFastly’s Kernel and Host Networking team builds and ships the Linux kernel that runs on every server in our global edge network, and every customer request passes through it. As a Staff engineer you own technical problems end to end: from a crash signature or a new NIC on the bench, through root cause and design, to a change that is upstreamed and safely running on thousands of servers. The work spans networking, XDP and e BPF, memory, performance and hardware enablement. It also spans layers. Our kernel is the datapath of a distributed system whose control planes are constantly pushing new state to the fleet, so staying correct under change is part of the job. Formal CS education is not required; demonstrable experience is what matters.
What You’ll Do:Set technical direction for kernel projects, own them end to end from problem statement to fleet rollout, and mentor engineers on the teamTake new servers, CPUs and NICs from first boot to full fleet: drivers, IRQ affinity,



RSS and queue layout on high core count hostsImprove datapath and transport performance with XDP, e BPF and protocol work based on IETF specificationsDebug problems that cross layers with application teams, such as MTU behavior, cgroup memory accounting and packet filteringDevelop and maintain kernel changes and Fastly kernel modules on our long term kernel line, and reduce our private delta by upstreamingMake sure state pushed from control planes to e BPF and XDP programs is applied, verified and safe to roll backOwn kernel health in production: triage crashes, WARNs and regressions across the fleet, find the root cause and ship the fixOwn and improve the kernel release process and the signals behind it: CI, bake, canary, staged rollout and rollback across thousands of servers, plus crash metrics and drift detection that fire before customers noticeJoin the on-call rotation, lead the kernel side of incidents and drive follow-up actions to closureWhat We’re Looking For:7+ years of related engineering experience, including substantial production C, with 3 of those years leading technical projectsProduction Linux kernel development, including debugging use-after-free, refcount and leak bugs with KASAN, kdump, ftrace, perf or bpftraceWorking knowledge of the scheduler and memory management (EEVDF, memcg)Experience managing a kernel patch stack and working with upstream communitiesSolid understanding of the Linux network stack (TCP/IP, sk_buff lifecycle, qdiscs, NIC drivers)



and XDP or e BPF, with deep expertise in at least one of these areasOperational discipline: staged rollouts, canaries, kill switches, observability, postmortems and closing action itemsUnderstanding of distributed systems: control plane and datapath consistency, partial failure and safe config rollout at fleet scaleAbility to design broadly scoped work and drive it across teamsWe’ll be super impressed if you have experience in any of these:Upstream kernel contributions or subsystem maintainershipDeep Knowledge of Transport protocols from IETF RFCs: QUIC, TCP, ECN and L4 S, MASQUEHardware enablement on AMD EPYC or Intel platforms, and NIC drivers such as mlx5, ice or i40eLoad balancing or traffic steering systemsCDN or large edge network environmentsContainer networking: network namespaces, veth, cgroups, and e BPF-based CNI datapathsWork Hours:This position requires availability during core business hours and participation in an on-call rotation.
Work Location(s) & Travel

Requirements:
This position is open to remote and hybrid work locations in the United States. Our US Fastly offices are located in:Recent York, NYSan Francisco, CADenver, COThis position may require travel as required by your role or requested by your manager.
SF / LA Fair Chance Ordinance StatementPursuant to the San Francisco Fair Chance Ordinance and the Los Angeles Fair Chance Initiative for Hiring Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

Salary:
The estimated salary range for this position in the US is $211,370 to $253,644.
Starting salary may vary based on permissible, non-discriminatory factors such as experience, skills, qualifications, and location.
This role may

📌 Staff Software Engineer (Quinte West)
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📍 Quinte West