Host Systems Software Engineer

We’re looking for an experienced systems software engineer to help define and build the host software stack for our custom next-generation AI systems. You will work close to the hardware on performance-critical software, including Linux kernel drivers, high-throughput I/O paths, and system-scale networking and RDMA. This role spans architecture, implementation, platform bring-up, debugging, and performance optimization. You will work across hardware and software boundaries to make new systems usable end to end, from low-level device interfaces through userspace tooling and production validation.

Responsibilities

Design, implement, and debug host-side systems software for AI infrastructure, including Linux kernel drivers and supporting userspace components; Build and optimize software paths for high-throughput, low-latency communication, including RDMA and related networking functionality; Develop software around PCIe, DMA, NICs, accelerators, memory movement, and device interaction; Bring up new hardware platforms and diagnose complex issues across kernel, firmware, networking, and hardware boundaries; Build tooling for integration, testing, diagnostics, observability, qualification, and performance characterization; Collaborate with hardware, networking, and platform teams to define interfaces and integrate new capabilities; Work with external vendors where needed to integrate technologies and drive issues to resolution; Contribute across the systems software stack as the platform and team evolve; Help shape the technical direction and engineering practices for a growing systems software stack

Requirements

Experience building low-level or performance-critical systems software; Strong programming skills in C or C++, with proficiency using Python and Linux tooling for automation and debugging; Strong Linux systems fundamentals and the ability to debug across hardware and software boundaries; Hands-on experience in at least one relevant area, such as Linux kernel drivers, kernel networking, RDMA, PCIe, DMA, NIC software, accelerator software, or high-performance I/O; Experience owning complex software projects from design through implementation, bring-up, and validation; Ability to thrive in ambiguity, work across subsystem boundaries, and build systems from scratch; Strong cross-functional communication skills

Nice to have

Experience developing Linux kernel drivers or other OS-level performance-critical components; Familiarity with RDMA or RoCE, ibverbs, kernel networking, or congestion-control concepts such as ECN and DCQCN; Experience with PCIe, DMA, peer-to-peer communication, SR-IOV, IOMMU, dma-buf, or related accelerator and I/O subsystems; Experience bringing up accelerators, NICs, SoCs, or custom hardware platforms; Experience profiling and optimizing high-throughput, low-latency systems; Familiarity with Rust or experience using Rust for systems programming