Senior AI Kernel Engineer

Modular; United States; On-site; USD 198,000 - 286,000; Full time

Benefits offered by this job

Premier insurance plans

401k matching

Flexible paid time off

Team building events

Job summary

Modular is seeking a Senior AI Kernel Engineer to lead design and optimization of high-performance kernels for AI inference on GPUs. This role involves working at the intersection of hardware and AI systems, ensuring efficient implementations at scale. The ideal candidate will have over 5 years of experience, strong C/C++ skills, and expertise in GPU programming. The position offers competitive compensation, including stock options and world-class benefits, with the office located in Los Altos, CA or the option to work remotely.

Qualifications

• 5+ years of experience in performance-critical systems or kernel development.
• Strong proficiency in C/C++ and low-level programming.
• Extensive hands-on experience with GPU kernel programming (CUDA, HIP, or equivalent).

Responsibilities

• Design, implement, and optimize performance-critical kernels for AI inference workloads.
• Lead kernel-level optimization efforts across various hardware environments.
• Analyze performance using profilers, hardware counters, and translate insights into improvements.

Skills

Performance-critical systems

C/C++ proficiency

GPU kernel programming

GPU architecture understanding

Problem-solving skills

Education

5+ years experience

Tools

CUDA

HIP

Job description

About Modular

At Modular, we’re on a mission to revolutionize AI infrastructure by systematically rebuilding the AI software stack from the ground up. Our team, made up of industry leaders and experts, is building cutting‑edge, modular infrastructure that simplifies AI development and deployment. By rethinking the complexities of AI systems, we’re empowering everyone to unlock AI’s full potential and tackle some of the world’s most pressing challenges.

If you’re passionate about shaping the future of AI and creating tools that make a real difference in people’s lives, we want you on our team. You can read about our culture and careers to understand how we work and what we value.

About The Role

We are seeking a Senior AI Kernel Engineer to lead the design and optimization of high‑performance kernels for large‑scale AI inference on GPUs and emerging custom accelerators. In this role, you will own performance‑critical paths, drive architectural decisions, and turn complex AI workloads into highly optimized implementations that run efficiently at scale. You will work at the intersection of hardware, compilers, and AI systems, collaborating closely with compiler, runtime, model, and infrastructure teams to deliver production‑quality inference performance.

LOCATION

Candidates based in the US or Canada are welcome to apply. You can work in our office in Los Altos, CA or remotely from home. Onboarding for new hires is conducted in‑person in our Los Altos, CA office.

What You Will Do

• Design, implement, and optimize performance‑critical kernels for AI inference workloads (e.g., GEMM, attention, communication, fusion).
• Lead kernel‑level optimization efforts across single‑GPU, multi‑GPU, and heterogeneous hardware environments.
• Make informed trade‑offs between latency, throughput, memory footprint, and numerical precision.
• Drive adoption of new hardware features (e.g., Tensor Cores, asynchronous execution, advanced memory spaces).
• Analyze performance using profilers, hardware counters, and microbenchmarks; translate insights into concrete improvements.
• Work closely with compiler and runtime teams to influence code generation, scheduling, and kernel fusion strategies.
• Review and mentor other engineers on kernel design, performance tuning, and best practices.
• Contribute to technical roadmaps and long‑term performance strategy for AI inference.

What You Bring To The Table

• 5+ years of experience in performance‑critical systems or kernel development (or equivalent depth of expertise).
• Strong proficiency in C/C++ and low‑level programming.
• Extensive hands‑on experience with GPU kernel programming (CUDA, HIP, or equivalent).
• Deep understanding of GPU architecture, including memory hierarchies, synchronization, and execution models.
• Proven track record of delivering measurable performance improvements in production systems.
• Strong problem‑solving skills and ability to work independently on complex, ambiguous performance challenges.

Helpful, But Not Required

• Experience with PTX, assembly‑level tuning, or code generation frameworks (e.g., Triton).
• Experience optimizing distributed or multi‑GPU inference pipelines.
• Familiarity with custom AI accelerators or domain‑specific hardware.
• Understanding of modern AI models (e.g., transformers, LLMs, diffusion) from a systems and performance perspective.
• Contributions to open‑source kernel libraries, compilers, or performance tools.
• Experience collaborating directly with hardware or compiler teams.

What Modular Brings To The Table

• Amazing Team. We are a progressive and agile team with some of the industry’s best engineering and product leaders.
• World‑class Benefits. In order to attract the best, we need to offer the best. Premier insurance plans, up to 5% 401k matching, flexible paid time off, and more are available to you! Please note that specific benefit packages may vary based on your location.
• Competitive Compensation. We offer very strong compensation packages, including stock options. We want people to be focused on their best work and believe in tailoring compensation plans to meet the needs of our workforce.
• Team Building Events. We organize regular team onsites and local meetups in Los Altos, CA as well as different cities. Traveling 2-4 times a year is expected for all roles.

Working at Modular will enable you to grow quickly as you work alongside incredibly motivated and talented people who have high standards, possess a growth mindset, and a purpose to truly change the world.

The estimated base salary range for this role to be performed in the US, regardless of the state, is $198,000.00 - $286,000.00 USD.

The estimated base salary range for this role to be performed in Canada, regardless of the province, is $194,000.00 - $280,000.00 CAD.

The salary for the successful applicant will depend on a variety of permissible, non‑discriminatory job‑related factors, which include but are not limited to education, training, work experience, business needs, or market demands. This range may be modified in the future. The total compensation for a candidate will also include annual target bonus, equity, and benefits, with equity making up a significant portion of your total compensation.

For candidates who fall outside of the listed requirements, we nevertheless encourage you to apply as we may have openings that are lower/higher level than the ones advertised.