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About the Role

Cornelis Networks is seeking engineers to develop and optimize AI/HPC communication middleware, contributing to cutting-edge ASIC design and distributed software systems.

Responsibilities

• Implement and optimize features for HPC middleware (MPI/SHMEM) and AI middleware (CCL stacks, e.g., NCCL/RCCL and related collective communication libraries).
• Assist in integrating middleware capabilities with underlying transports and provider layers (e.g., libfabric/OFI, UCX, verbs-like semantics).
• Prepare and submit upstream contributions across MPI/SHMEM projects, CCL ecosystems, and related components.
• Collaborate with kernel/driver and switch teams to deliver end-to-end performance aligned with the Cornelis product roadmap.
• Analyze performance traces, reproduce customer issues, and translate findings into fixes.

Requirements

• 2+ years of experience in systems programming in C/C++ on Linux.
• 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 ability to diagnose issues using profiling/tracing tools, or a strong willingness to learn.
• Foundational understanding of networking and/or RDMA concepts.

Skills

• C/C++
• Linux
• MPI/SHMEM
• NCCL/RCCL
• CUDA/ROCm
• CCL stacks
• libfabric/OFI
• UCX
• verbs-like semantics
• Networking
• RDMA
• Open-source contribution
• libfabric providers
• Ultra Ethernet (UEC/UET) specifications
• RoCEv2
• Congestion control
• Ethernet-based RDMA deployments
• Benchmarking
• Profiling
• Optimization
• Omni-Path/OPX
• Ethernet-based HPC fabrics

Location

• United States

Work Type

• Remote
• Onsite
• Hybrid

Experience Level

• 2+ years of experience

Education Level

• Bachelor's degree in Computer Science, Engineering, or related field (or equivalent experience)
• Master's or Doctorate a plus

Salary/Compensations

• Competitive compensation package includes equity, cash, and incentives.
• Base pay determined by skills, qualifications, experience, and location.
• Potential eligibility for performance-based incentives, including annual bonus or sales incentives.

Benefits

• 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

About the Company

• Cornelis Networks is building the future of AI and HPC networking with an AI-first approach to silicon and software development.
• Delivers the world’s highest performance scale-out networking solutions for AI and HPC datacenters.
• Differentiated architecture seamlessly integrates hardware, software, and system-level technologies to maximize efficiency of compute clusters.
• Solutions drive breakthroughs in AI & HPC workloads.
• Backed by top-tier venture capital and strategic investors.
• Committed to innovation, performance, and scalability.
• A fast-growing, forward-thinking team of architects, engineers, and business professionals with a proven track record of building successful products and companies.
• A global organization with a team spanning multiple U.S. states and six countries.

Equal Opportunity

• Cornelis Networks is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
• Encourages applications from all qualified candidates and will accommodate applicants’ needs under the respective laws throughout all stages of the recruitment and selection process.