CUDA Kernel Engineer

Pragmatike; Cambridge (MA); On-site; USD 150,000 - 190,000; Full time

Benefits offered by this job

Sign-on bonus

Health insurance

Dental insurance

Vision insurance

401k

Equity options

Job summary

Pragmatike is seeking a CUDA Kernel Engineer to design, implement, and optimize custom CUDA kernels for NVIDIA GPUs powering large-scale AI systems. You will focus on maximizing occupancy, memory throughput, and warp efficiency while profiling workloads with Nsight and NVProf.

You’ll diagnose bottlenecks such as warp divergence and memory access patterns, and collaborate with AI systems, backend, and model acceleration teams to push GPU performance at scale.

Qualifications

• Proven track record building NVIDIA CUDA kernels from scratch.
• 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.

Responsibilities

• 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.

Skills

CUDA kernels

Kernel optimization

CUDA architecture

PCIe optimization

C++ / CUDA tooling

Tools

NCCL

NVLink

MIG

TensorRT

CUTLASS

CUDA Graphs

PTX/SASS analysis

Job description

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.

We are searching for a CUDA Kernel Engineer who has hands-on experience developing and optimizing NVIDIA CUDA kernels from scratch. You will work on the GPU performance layer powering large-scale, high-throughput AI systems used by Fortune 500 customers.

This role is ideal for someone who deeply understands NVIDIA GPU architecture, memory hierarchy, warp‑level execution, and profiling workflowsnot someone coming from generic hardware, FPGA, or non‑NVIDIA compute backgrounds. You will directly influence the GPU efficiency, throughput, and scalability of mission‑critical AI systems.

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 ofCUDA 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.


• 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.