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Founding GPU Kernel Engineer

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YC Work at a Startup

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Location:
United States , San Francisco

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

285000.00 - 315000.00 USD / Year
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Job Description:

We're looking for a Founding GPU Kernel Engineer who lives right at the boundary between hardware and software. Someone who thinks in warps, occupancy, and memory hierarchies, and can squeeze every last FLOP out of a GPU. Your job is to go deeper than anyone else. You'll hand-tune kernels to figure out what's actually possible on the hardware, and then turn that knowledge into compiler optimization passes that help every model we compile.

Job Responsibility:

  • Write and hand-optimize GPU kernels for ML workloads (matmuls, attention, normalization, etc.) to set the performance ceilings
  • Profile at the microarchitectural level: look into SM utilization, warp stalls, memory bank conflicts, register pressure, instruction throughput
  • Debug performance issues by digging deep into things like clock speeds, thermal throttling, driver behavior, hardware errata
  • Turn your hand-optimization insights into automated compiler passes (working closely with our compiler team)
  • Develop performance models that predict how kernels will behave across different GPU architectures
  • Build tools and methods for systematic kernel optimization
  • Work with NVIDIA, AMD, and emerging AI accelerators - understand the common parts and what's vendor-specific

Requirements:

  • Deep expertise in GPU architecture
  • Proven track record of hand-writing kernels that match or beat vendor libraries (cuBLAS, cuDNN, CUTLASS)
  • Strong skills with low-level profiling tools: Nsight Compute, Nsight Systems, rocprof, or equivalents
  • Experience reading and reasoning about PTX/SASS or GPU assembly
  • Solid systems programming in C++ and CUDA (or ROCm/HIP)
  • Good understanding of how high-level ML operations map to hardware execution
  • Experience with distributed training systems: collective ops like all-reduce and all-gather, NCCL/RCCL, multi-node communication patterns

Nice to have:

  • HPC background: experience with large-scale scientific computing, MPI, or work in supercomputing
  • Background in electrical engineering, computer architecture, or hardware design
  • Driver development experience (NVIDIA, AMD, or other accelerators)
  • Experience with MLIR, LLVM, or compiler backends
  • Deep knowledge of distributed ML training: gradient accumulation, activation checkpointing, pipeline/tensor parallelism, ZeRO-style optimizations
  • Familiarity with custom accelerators: TPUs, Trainium, Inferentia, or similar
  • Knowledge of high-speed interconnects: NVLink, NVSwitch, InfiniBand, RoCE
  • Publications or contributions in GPU optimization, HPC, or ML systems
  • Experience at NVIDIA, AMD, a national lab, or an AI hardware/infrastructure company
What we offer:
  • bonus
  • equity
  • benefits
  • relocation assistance

Additional Information:

Job Posted:
January 16, 2026

Employment Type:
Fulltime
Work Type:
On-site work
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