Cornelis Networks, Inc.

Cornelis Networks, Inc.

Senior Linux Kernel & Driver Engineer – HPC/AI Fabrics

Austin, Texas, United States · Senior

Sponsorship not specifiedDetected 21 days ago
PythonBashExpressCode ReviewLinuxTest AutomationCommunication

About the role

  • Our differentiated architecture seamlessly integrates hardware, software and system level technologies to maximize the efficiency of GPU, CPU and accelerator-based compute clusters at any scale.
  • As a global organization, our team spans multiple U.S. states and six countries, and we continue to expand with exceptional talent in onsite, hybrid, and fully remote roles.
  • This role is remote from within the United States.

Responsibilities

  • Design & Optimize Device Drivers: Develop, maintain, and upstream the open-source `hfi1` kernel driver and related subsystems (such as InfiniBand verbs and RDMA core).
  • Hardware-Software Co-Design: Partner closely with silicon architects and hardware developers to define register interfaces, MMIO pathways, command queues, and hardware-software contracts.
  • Develop Zero-Copy Data Paths: Design and optimize low-latency, high-throughput DMA and RDMA transport engines, minimizing buffer copies and maximizing CPU-bypass capabilities.
  • Package & Build Automation: Maintain and optimize system build environments, kernel-module packages (DKMS, RPM, Kbuild), and automated integration tests.
  • Develop, maintain, and upstream the open-source `hfi1` kernel driver and related subsystems (such as InfiniBand verbs and RDMA core).
  • Partner closely with silicon architects and hardware developers to define register interfaces, MMIO pathways, command queues, and hardware-software contracts.
  • Design and optimize low-latency, high-throughput DMA and RDMA transport engines, minimizing buffer copies and maximizing CPU-bypass capabilities.
  • Maintain and optimize system build environments, kernel-module packages (DKMS, RPM, Kbuild), and automated integration tests.

Requirements

  • Kernel-Space Mastery: 3+ years of professional experience writing production-grade C code inside the Linux kernel (kernel modules, LKM, memory management, or interrupt handlers).
  • High-Speed Networking Protocol Knowledge: Direct experience with RDMA, InfiniBand (IB) Verbs, RoCE, or high-performance user-space bypass frameworks (such as libfabric / OFI or DPDK).
  • Hardware Interface Fundamentals: Strong understanding of PCIe architectures, DMA engines, memory mapping (`mmap`), and MMIO.
  • Advanced Kernel Debugging: Hands-on proficiency with kernel analysis tools including `KASAN`, `kmemleak`, `ftrace`, `tracepoints`, `kprobes`, and core crash dump analysis.
  • Scripting & Automation: Proficiency in scripting languages (e.g., Python, Bash) for automated testing and performance profiling.
  • Active track record of contributions to upstream `kernel.org` (specifically under `drivers/infiniband/` or `drivers/net/`).
  • Familiarity with kernel storage protocols (e.g., Lustre, NFS, SRP).
  • Experience with GPU-direct communication technologies (e.g., GPUDirect RDMA, DMA-buf).
  • Direct experience with RDMA, InfiniBand (IB) Verbs, RoCE, or high-performance user-space bypass frameworks (such as libfabric / OFI or DPDK).
  • Hands-on proficiency with kernel analysis tools including `KASAN`, `kmemleak`, `ftrace`, `tracepoints`, `kprobes`, and core crash dump analysis.
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