[Hiring] Software Engineer – AI/HPC Middleware @Cornelis Networks, Inc.

Role Description

We are seeking a Software Engineer to help develop and optimize Cornelis Networks' AI/HPC communication middleware. Working under the guidance of senior team members, you will contribute to enabling and tuning HPC middleware (MPI/SHMEM) and AI middleware (collective communication libraries / CCL, e.g., NCCL/RCCL and related stacks) over Cornelis Networks' interconnects. You will grow your expertise across the stack (drivers/kernel, switches, systems, and application/framework teams) while contributing to features, testing, and upstream open-source work.

Key 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.

Qualifications

• 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). Master's or Doctorate a plus.
• 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.

Requirements

• 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

• Competitive compensation package that includes equity, cash, and incentives.
• Health and retirement benefits.
• Medical, dental, and vision coverage.
• Disability and life insurance.
• Dependent care flexible spending account.
• Accidental injury insurance and pet insurance.
• Generous paid holidays.
• 401(k) with company match.
• Open Time Off (OTO) for regular full-time exempt employees.
• Other paid time off benefits include sick time, bonding leave, and pregnancy disability leave.