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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:

ML developers today face significant friction in taking trained models into deployment. They work in a highly fragmented space, with incomplete and patchwork solutions that require significant performance tuning and non-generalizable/ model-specific enhancements. At Modular, we are building the next generation AI platform that will radically improve the way developers build and deploy AI models.

As an AI Kernel Engineer, you'll be instrumental in building our core libraries that enable developers to leverage deployment-specific optimizations across diverse model families and frameworks. You will be crafting high-performance kernels for GPUs and emerging hardware architectures. You'll drive critical performance improvements through kernel optimizations that:

Accelerate model latency and maximize throughput
Minimize communication overhead and optimize resource utilization
Streamline memory usage through reduced activation volumes
Enhance data pre- and post-processing pipelines
Deliver measurable end-to-end performance gains across our model ecosystem

This role puts you at the cutting edge of AI infrastructure, where your work directly impacts the speed and efficiency of AI applications at scale.

LOCATION: Candidates based in the US or Canada are welcome to apply. To support growth and collaboration, those in earlier career stages work in a hybrid capacity at our Los Altos, CA office (minimum 2 days per week on-site) with relocation assistance provided for out-of-state candidates.

What you will do:

Design and optimize high-performance ML numeric and data manipulation kernels.
Benchmark kernel performance and conduct performance analysis.
Diagnose performance bottlenecks and implement kernel improvements.
Collaborate with framework and compiler teams to deliver end-to-end AI performance that fully utilizes new hardware or GPU capabilities.
Ensure kernel correctness, maintainability, and test coverage.

What you bring to the table:

Experience in GPU programming and parallel computing
Solid understanding of CPU/GPU memory hierarchy and performance modeling
Proficiency in Python or C++
Familiarity with assembly language
Hands-on experience with GPU profiling and debugging tools
Strong foundation in algorithms and data structures
Deep interest in machine learning technologies and use cases.
Creativity and curiosity for solving complex problems, a team-oriented attitude that enables you to work well with others, and alignment with our culture.

Helpful but not required:

Experience with ML framework kernel development (Triton, PyTorch, TensorFlow XLA) and libraries (cuBLAS, CUTE etc.)
Knowledge of GPU ISA-level optimization (PTX, SASS, GCN).
Experience with multi-GPU communication frameworks (NCCL, RCCL, MPI).
Contributions to open-source GPU or HPC communities.
Knowledge of AI algorithms and state-of-the-art LLMs

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 $135,000.00 - $204,000.00 USD.

The estimated base salary range for this role to be performed in Canada, regardless of the province, is $132,000.00 - $200,000.00 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.

Modular is proud to emphasize an equal opportunity, safe environment for people to do their best work. Modular is an affirmative action employer. We are committed to providing equal employment opportunities regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity, or Veteran status. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements.

If you require reasonable accommodations to participate in the interview process, please let your recruiter know, and we will work with you to meet your needs in compliance with the ADA.

This employer participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S. If E-Verify cannot confirm that you are authorized to work, this employer is required to give you written instructions and an opportunity to contact Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment. Employers can only use E-Verify once you have accepted a job offer and completed the Form I-9.

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