CUDA Kernel Engineer (Remote US)

Pragmatike; California (MO); On-site; USD 180,000 - 240,000; Full time

Benefits offered by this job

Health, Dental, and Vision

Sign-on bonus

401k

Job summary

Pragmatike is seeking an experienced GPU performance engineer to design and optimize CUDA kernels for NVIDIA GPUs in a fast-growing AI startup. You will optimize memory usage, profiling methods, and kernel launches to maximize throughput.

Responsibilities include challenging performance tuning, collaboration with AI and backend teams, and contributing to GPU architecture decisions. The role requires hands-on CUDA/C++ expertise and on-site work in SF.

Qualifications

• Proven track record building NVIDIA CUDA kernels from scratch.
• Strong ability to optimize kernels (tiling, occupancy, shared memory).
• Deep understanding of CUDA threads, warps, memory hierarchy, and warp divergence.

Responsibilities

• Design, implement, and optimize CUDA kernels for NVIDIA GPUs to maximize occupancy and throughput.
• Profile GPU workloads using Nsight Compute, Nsight Systems, nvprof, and CUDA-MEMCHECK.
• Analyze and eliminate performance bottlenecks like warp divergence and memory access issues.
• Improve memory pipelines (global/shared/L2/texture) and ensure memory coalescing.
• Collaborate with AI systems, model acceleration, and backend teams.
• Contribute to GPU architecture decisions and internal performance engineering practices.

Skills

CUDA kernel design

GPU performance optimization

CUDA memory management

C++ programming

Profiling and debugging

Tools

Nsight Compute

Nsight Systems

nvprof

CUDA-MEMCHECK

Job description

About The Role

Pragmatike is hiring on behalf of a

Location: SF on-site Start date: ASAP Languages: English (required)

About The Role

Pragmatike is hiring on behalf of a fast-growing AI startup recognized as a Top 10 GenAI company by GTM Capital, founded by MIT CSAIL researchers.

What Youll Do

• Design, implement, and optimize custom CUDA kernels for NVIDIA GPUs, with a focus on maximizing occupancy, memory throughput, and warp efficiency.
• Profile GPU workloads using tools such as Nsight Compute, Nsight Systems, nvprof, and CUDA‑MEMCHECK.
• Analyze and eliminate performance bottlenecks including warp divergence, uncoalesced memory access, register pressure, and PCIe transfer overhead.
• Improve GPU memory pipelines (global, shared, L2, texture memory) and ensure proper memory coalescing.
• Collaborate closely with AI systems, model acceleration, and backend distributed systems teams.
• Contribute to GPU architecture decisions, kernel libraries, and internal performance-engineering best practices.

What Were Looking For

• Proven track record building NVIDIA CUDA kernels from scratchnot just calling existing libraries.
• Strong ability to optimize kernels (tiling strategies, occupancy tuning, shared memory design, warp scheduling).
• Deep understanding of CUDA threads, warps, blocks, and grids, GPU memory hierarchy and memory coalescing, as well as warp divergence (how to detect, analyze, and mitigate it)
• Experience diagnosing PCIe bottlenecks and optimizing host-device transfers (pinned memory, streams, batching, overlap).
• Familiarity with C++, CUDA runtime APIs, and GPU debugging/profiling tooling.

Bonus Points

• Experience with multi-GPU or distributed GPU systems (NCCL, NVLink, MIG).
• Background in GPU acceleration for ML frameworks or HPC workloads.
• Knowledge of model inference optimization (TensorRT, CUDA Graphs, CUTLASS).
• Exposure to compiler-level optimization or PTX/SASS analysis.
• Startup experience or comfort working in fast-moving, ambiguous environments.

Why This Role Will Pivot Your Career

• Research pedigree: MIT CSAIL founders recognized for breakthrough AI and systems contributions.
• Customer impact: Deploy AI solutions powering Fortune 500 clients.
• Industry momentum: Lab alumni have led high-value acquisitions (MosaicML Databricks, Run:AI Nvidia, W&B CoreWeave).
• Funding & growth: Oversubscribed seed round, next funding in 2026.
• Career growth & influence: Lead AI initiatives, optimize pipelines, and directly impact production AI systems at scale.
• Culture & autonomy: Own critical systems while collaborating with world-class engineers.
• Aspirational impact: Solve GPU/AI performance challenges few engineers ever face.

Benefits

• Competitive salary & equity options
• Sign-on bonus
• Health, Dental, and Vision
• 401k

Pragmatike is an Equal Opportunity Employer and is committed to providing equal employment opportunities to all applicants without discrimination. We recruit on behalf of our clients and prohibit discrimination and harassment based on race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation, and training.We are committed to a fair and inclusive hiring process. We process your personal data solely for recruitment purposes, in accordance with applicable privacy laws, and maintain reasonable safeguards to protect your information. Your data may be shared with our client(s) for hiring consideration, but will not be disclosed to third parties outside of the recruitment process.