{"schemaVersion":"jobsearcher.job.v1","id":"c94e4c699d44cc56526f149f","url":"https://jobsearcher.com/jobs/c94e4c699d44cc56526f149f","canonicalUrl":"https://jobsearcher.com/jobs/c94e4c699d44cc56526f149f","title":"Software Engineer - Kernels/CUDA (C++)","description":"SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.\nABOUT THE ROLE:\nWe are building one of the world’s largest AI supercomputers from the ground up. As part of the Compute Infrastructure team, you will own both the raw GPU supercomputer and the platform layer that runs on top of it. You will work across the full stack — from low-level GPU kernel optimizations and Linux kernel internals to massive-scale orchestration and virtualization — to make training and inference at SpaceXAI as fast, reliable, and scalable as possible.\nThis is a broad, high-impact role that combines hardcore supercompute and compute infrastructure work. Your contributions will directly accelerate Grok’s training speed and overall AI progress.\nRESPONSIBILITIES:\nDesign, build, and optimize massive GPU clusters for extreme-scale training and inference workloads\nDevelop and tune low-level CUDA kernels (GeMM, Attention, etc.), using CUTLASS, Tensor Cores, and Nsight for maximum performance\nProfile, debug, and eliminate bottlenecks across GPU memory hierarchy, networking fabric, filesystems, and multi-GPU operation\nCollaborate closely with AI research teams to deliver production-grade performance and scalability\nPREFERRED SKILLS AND EXPERIENCE:\nDeep low-level systems programming (C/C++/PTX/SASS)\nStrong experience with large-scale GPU clusters or distributed compute infrastructure at production scale\nHands-on work with GPU kernel optimization (CUTLASS, custom kernels, Nsight profiling)\nTrack record of building or running high-performance infrastructure for AI workloads (training or inference platforms)\nAbility to reason from first principles and optimize for both memory-bound and compute-bound scenarios\nCOMPENSATION AND BENEFITS:\n$180,000 - $440,000 USD\nBase salary is just one part of our total rewards package at SpaceXAI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.\nSpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.","company":"XAI","rawCompany":"xai","city":"Seattle","state":"WA","isRemote":false,"isActive":false,"createdAt":"2026-07-22T01:31:56.365Z","occupations":[{"code":"15-1252.00","title":"Software Developers","slug":"software-developers"},{"code":"15-1299.08","title":"Computer Systems Engineers/Architects","slug":"computer-systems-engineers-architects"},{"code":"15-1251.00","title":"Computer Programmers","slug":"computer-programmers"}],"industries":[{"code":"541512","title":"Computer Systems Design Services","slug":"computer-systems-design-services"},{"code":"513210","title":"Software Publishers","slug":"software-publishers"},{"code":"541511","title":"Custom Computer Programming Services","slug":"custom-computer-programming-services"}],"jobPosting":{"@context":"https://schema.org","@type":"JobPosting","title":"Software Engineer - Kernels/CUDA (C++)","description":"SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.\nABOUT THE ROLE:\nWe are building one of the world’s largest AI supercomputers from the ground up. As part of the Compute Infrastructure team, you will own both the raw GPU supercomputer and the platform layer that runs on top of it. You will work across the full stack — from low-level GPU kernel optimizations and Linux kernel internals to massive-scale orchestration and virtualization — to make training and inference at SpaceXAI as fast, reliable, and scalable as possible.\nThis is a broad, high-impact role that combines hardcore supercompute and compute infrastructure work. Your contributions will directly accelerate Grok’s training speed and overall AI progress.\nRESPONSIBILITIES:\nDesign, build, and optimize massive GPU clusters for extreme-scale training and inference workloads\nDevelop and tune low-level CUDA kernels (GeMM, Attention, etc.), using CUTLASS, Tensor Cores, and Nsight for maximum performance\nProfile, debug, and eliminate bottlenecks across GPU memory hierarchy, networking fabric, filesystems, and multi-GPU operation\nCollaborate closely with AI research teams to deliver production-grade performance and scalability\nPREFERRED SKILLS AND EXPERIENCE:\nDeep low-level systems programming (C/C++/PTX/SASS)\nStrong experience with large-scale GPU clusters or distributed compute infrastructure at production scale\nHands-on work with GPU kernel optimization (CUTLASS, custom kernels, Nsight profiling)\nTrack record of building or running high-performance infrastructure for AI workloads (training or inference platforms)\nAbility to reason from first principles and optimize for both memory-bound and compute-bound scenarios\nCOMPENSATION AND BENEFITS:\n$180,000 - $440,000 USD\nBase salary is just one part of our total rewards package at SpaceXAI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.\nSpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.","datePosted":"2026-07-22T01:31:56.365Z","dateModified":"2026-07-22T01:31:56.365Z","hiringOrganization":{"@type":"Organization","name":"XAI","sameAs":"https://jobsearcher.com"},"jobLocation":{"@type":"Place","address":{"@type":"PostalAddress","addressLocality":"Seattle","addressRegion":"WA","addressCountry":"US"}},"identifier":{"@type":"PropertyValue","name":"JobSearcher","value":"c94e4c699d44cc56526f149f"},"url":"https://jobsearcher.com/jobs/c94e4c699d44cc56526f149f"}}