Senior Software Engineer CXI Drivers & Kernel Networking

We are focused on delivering innovative solutions that accelerate our customers digital transformation, enabling them to tackle their complex, and data-intensive workloads. Combining deep expertise and the development of the world s most cutting-edge, high-performance supercomputers, is defining the next era of computing delivering valuable insight innovation. Join us and redefine what s next for you.

What youll do:

• Develop, and maintain Linux kernel drivers for the CXI interconnect, including:

  • CXI Core Driver (shared hardware abstraction and resource management)
  • CXI User Driver (user-space access, queue management, protection domains)
  • CXI Ethernet Driver (IP, RXE, sockets integration)

• Lead 800G CXI driver development :

  • resource partitioning
  • Interaction with IOMMU, PCIe, and virtualization stacks

• Own kernel interfaces used by:

  • Lustre/LNet (kCXI, kfabric provider)
  • Verbs / RXE paths
  • User-space libraries (libcxi, libfabric providers)

• Drive performance, scalability, and reliability improvements:

  • Low-latency paths, queueing models, retry/timeout handling
  • Error reporting, recovery, and fault isolation

What you need to bring:

• 10+ years of systems software experience with deep expertise in Linux kernel development

• Strong experience with:

  • PCIe, DMA, interrupts, memory management
  • Linux networking stack (netdev, IP, sockets, RDMA/RXE)
• Hands-on experience with Switch or NIC Software Stacks, especially in the low-level kernel and user space
• Proven ability to debug complex kernel + hardware interactions
• Excellent C programming and kernel debugging skills

Preferred Qualifications

• Experience with HPC or AI networking (RDMA, libfabric, MPI, storage fabrics)
• Familiarity with Lustre/LNet or high-performance storage stacks
• Experience working with custom NICs or ASIC-based interconnects

Additional Skills:

Cloud Architectures, Cross Domain Knowledge, Design Thinking, Development Fundamentals, DevOps, Distributed Computing, Microservices Fluency, Full Stack Development, Security-First Mindset, Solutions Design, Testing Automation, User Experience (UX)

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