• Lead design and implementation enabling and optimizing HPC middleware (MPI and SHMEM) and AI middleware CCL stacks (e.g., NCCL/RCCL and related collective communication libraries) • Deliver performance-critical communication paths including low-latency small and medium message transfers, bulk SDMA data movement, GPU-Direct and IPC communication, and collective acceleration • Design and tune collective communication algorithms (latency-optimized and bandwidth-optimized), including GPU-aware collectives • Integrate middleware with underlying transports and provider layers such as libfabric/OFI, UCX, and verbs-style interfaces to achieve performance, portability, and maintainability • Implement and optimize memory registration strategies, progress and execution models, completion semantics, multi-rail communication behavior, and GPU memory handling • Drive upstream contributions across MPI/SHMEM projects, CCL ecosystems, and related components with a focus on upstreamable design and long-term maintainability • Represent Cornelis Networks in open-source communities through technical reviews, design discussions, and sustained technical leadership • Implement and prototype Ultra Ethernet capabilities supporting MPI/SHMEM and AI collective communication use cases • Collaborate with ecosystem partners to validate deployment models and performance scaling on customer-relevant configurations • Work closely with kernel, driver, and switch teams to deliver end-to-end performance aligned with the Cornelis product roadmap • Participate in architecture reviews, performance tuning, scaling validation, and multi-layer root-cause investigations • Analyze performance traces and triage advanced customer issues, translating findings into robust fixes and upstream improvements • Publish internal and external best practices, including tuning guidance, reference configurations, and debugging methodologies • Mentor senior engineers and promote best practices for design, testing, documentation, and code quality • Help define the long-term middleware technical roadmap aligned with product evolution and customer needs