Remote Senior AI/HPC Middleware Engineer

cornelisnetworks; New York (NY); On-site; USD 150,000 - 210,000; Full time

Job summary

Cornelis Networks seeks an experienced Senior Software Engineer to contribute to the design, development, and upstream enablement of AI/HPC communication middleware. This role focuses on enabling and optimizing HPC middleware (MPI/SHMEM) and AI middleware (collective communication libraries / CCL, e.g., NCCL/RCCL) over Cornelis Networks' interconnects.

You will help drive performance and deployability across real workloads.

Qualifications

• 6+ years of experience in systems programming in C/C++ on Linux.
• Hands-on experience with HPC middleware internals (Open MPI, MPICH, MVAPICH, and/or SHMEM) or optimizing collective communications for AI, including NCCL/RCCL, CUDA/ROCm.
• Demonstrated ability to deliver low-latency/high-throughput communication paths and to diagnose performance issues using profiling/tracing tools.
• Working knowledge of transport/integration layers such as OFI/libfabric, UCX, verbs-style concepts.
• Solid background in RDMA concepts and performance tuning.
• Experience contributing to open-source projects.

Responsibilities

• Enablement and optimization of HPC middleware (HPI and SHMEM) and AI middleware (CCL stacks ie: NCCL/RCCL and related collective communication libraries).
• Assist in integrating middleware capabilities with underlying transports and provider layers (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 to the Cornelis product roadmap.
• Analyze performance traces and reproduce customer issues, and translate findings into fixes.

Skills

C/C++

Linux

MPI/SHMEM

Profiling tools

RDMA concepts

Open source

UCX/libfabric

Education

Bachelor's degree in CS/Engineering

Tools

NCCL/RCCL

CUDA/ROCm

libfabric providers

Job description

Cornelis Networks seeks an experienced Senior Software Engineer to contribute to the design, development, and upstream enablement of AI/HPC communication middleware. This role focuses on enabling and optimizing HPC middleware (MPI/SHMEM) and AI middleware (collective communication libraries / CCL, e.g., NCCL/RCCL) over Cornelis Networks' interconnects.

You will help drive performance and deployability across real workloads.