Software Engineer – AI/HPC Middleware

Summary

Cornelis Networks develops high-performance scale-out networking solutions for AI and HPC datacenters, integrating hardware, software, and system-level technologies for compute clusters. The Software Engineer will develop and optimize AI/HPC communication middleware, integrate it with transport layers, contribute to open-source projects, collaborate across the software and hardware stack, and help diagnose customer performance issues.

Responsibilities

• AI/HPC Middleware Enablement & Optimization: Implement and help optimize features for HPC middleware (HPI and SHMEM) and AI middleware (CCL stacks ie: NCCL/RCCL and related collective communication libraries)
• Transport & Integration: Assist in integrating middleware capabilities with underlying transports and provider layers (ie: libfabric / OFI, UCX, verbs-like semantics where applicable)
• Upstream & Open-Source Leadership: Prepare and submit upstream contributions across MPI/SHMEM projects, CCL ecosystems, and related components
• Cross-Stack Collaboration & Performance Validation: Collaborate with kernel/driver and switch teams to help deliver end-to-end performance aligned to the Cornelis product roadmap
• Customer & Field Impact: Help analyze performance traces and reproduce customer issues, and assist in translating findings into fixes

Skills

• * 2+ years of experience in systems programming in C/C++ on Linux; Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience)
• * Exposure to or coursework/project experience with HPC middleware (e.g., MPI/SHMEM) and/or AI collective communication libraries (e.g., NCCL/RCCL, CUDA/ROCm) and/or other CCL stacks
• * Familiarity with performance concepts and an ability to diagnose issues using profiling/tracing tools, or a strong willingness to learn
• * Foundational understanding of networking and/or RDMA concepts
• Location: This is a remote position for employees residing within the United States
• * Experience contributing to open-source projects
• * Exposure to libfabric providers
• * Familiarity with Ultra Ethernet (UEC/UET) specifications
• * Experience with RoCEv2, congestion control, and/or Ethernet-based RDMA deployments
• * Experience with benchmarking, profiling, and optimization
• * Background with Omni-Path/OPX or Ethernet-based HPC fabrics

Qualifications

Must Haves

• * 2+ years of experience in systems programming in C/C++ on Linux; Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience)
• * Exposure to or coursework/project experience with HPC middleware (e.g., MPI/SHMEM) and/or AI collective communication libraries (e.g., NCCL/RCCL, CUDA/ROCm) and/or other CCL stacks
• * Familiarity with performance concepts and an ability to diagnose issues using profiling/tracing tools, or a strong willingness to learn
• * Foundational understanding of networking and/or RDMA concepts
• Location: This is a remote position for employees residing within the United States

Nice to Haves

• * Experience contributing to open-source projects
• * Exposure to libfabric providers
• * Familiarity with Ultra Ethernet (UEC/UET) specifications
• * Experience with RoCEv2, congestion control, and/or Ethernet-based RDMA deployments
• * Experience with benchmarking, profiling, and optimization
• * Background with Omni-Path/OPX or Ethernet-based HPC fabrics

Benefits

• Equity
• Performance-based incentives, including an annual bonus or sales incentives
• Medical coverage
• Dental coverage
• Vision coverage
• Disability insurance
• Life insurance
• Dependent care flexible spending account
• Accidental injury insurance
• Pet insurance
• Generous paid holidays
• 401(k) with company match
• Open Time Off (OTO) for regular full-time exempt employees
• Sick time
• Bonding leave
• Pregnancy disability leave
• Remote work for employees residing within the United States
• Flexible work environment