Senior Software Engineer (AI/HPC Middleware)

Location: Remote for employees residing within the United States; the position is associated with New York, New York.

Company

hirify.global develops high-performance scale-out networking solutions for AI and HPC datacenters, integrating silicon, software, and system technologies for GPU, CPU, and accelerator clusters.

What you will do

• Design, develop, and optimize HPC middleware such as MPI and SHMEM, along with AI collective communication libraries including NCCL and RCCL.
• Integrate middleware capabilities with transport and provider layers such as OFI/libfabric, UCX, and verbs-style interfaces.
• Prepare and submit upstream contributions to MPI, SHMEM, collective communication, and related open-source projects.
• Collaborate with kernel, driver, switch, systems, and application teams to deliver end-to-end performance.
• Analyze performance traces, reproduce customer issues, and translate findings into fixes for real-world workloads.

Requirements

• 6+ years of systems programming experience in C/C++ on Linux and a bachelor's degree in computer science, engineering, or a related field, or equivalent experience.
• Hands-on experience with HPC middleware internals such as Open MPI, MPICH, MVAPICH, or SHMEM, or with AI collective communications including NCCL, RCCL, CUDA, or ROCm.
• Experience delivering low-latency and high-throughput communication paths and diagnosing performance issues with profiling and tracing tools.
• Working knowledge of OFI/libfabric, UCX, verbs-style concepts, RDMA, and performance tuning.
• Experience contributing to open-source projects.
• Applicants must reside within the United States.

Nice to have

• Experience developing or maintaining libfabric providers.
• Familiarity with Ultra Ethernet specifications, RoCEv2, congestion control, or Ethernet-based RDMA.
• Experience with cluster-scale benchmarking, profiling, and optimization.
• Background with HPC fabrics such as Omni-Path.

Culture & Benefits

• Flexible remote work environment within the United States.
• Competitive compensation including base pay, equity, cash, and performance-based incentives.
• Medical, dental, vision, disability, life, dependent care, accidental injury, and pet insurance.
• Paid holidays, sick time, bonding leave, pregnancy disability leave, and Open Time Off for eligible full-time exempt employees.
• 401(k) plan with company match.