Jobs in the United States

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Added 2 mins ago
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Project Engineer II, Automation
Default (MSD)
Gaithersburg, MD
- $78,100 to $116,200 USD / year
Triage multi-project purchasing, design control activities, and issues to keep projects on the critical path.
Added 3 mins ago
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Manufacturing Quality Engineer
Apple
Cupertino, CA
- $163,500 to $246,200 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Apply Geometric Dimensions and Tolerance to ensure proper…
Added 3 mins ago
CPU Implementation Engineer
Apple
Cupertino, CA
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Responsible for central processing unit (CPU) development. Perform…
Added 3 mins ago
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Formal Validation Engineer
Apple
Cupertino, CA
- $207,673 to $277,600 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work on the complete formal verification for single or multiple design…
Added 3 mins ago
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Systems Design Engineer
Apple
San Diego, CA
- $137,500 to $207,100 USD / year
APPLE INC has the following available in San Diego, California. Work with the HW/SW development teams and other cross functional teams on identifying issues impacting the Cellular…
Added 3 mins ago
FE Engineer
Apple
Austin, TX
…closely with Architecture to understand performance goals of the design. Correlate RTL performance against model performance. Perform deep performance analysis in the design and report…
Added 3 mins ago
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CPU Design Verification Engineer
Apple
Cupertino, CA
- $174,149 to $194,700 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work closely with architecture and RTL designers on verifying the…
Added 3 mins ago
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Physical Design Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work with logic design team to understand partition architecture and…
Added 3 mins ago
A
Physical Design Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work with logic design team to understand partition architecture and…
Added 3 mins ago
A
Power Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
Applying logic design principles including timing and power implications.
Added 3 mins ago
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Design for Test Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino , California and various unanticipated locations throughout the USA. Review Architecture and Design Specifications. Extract design…
Added 3 mins ago
Physical Design Engineer
Apple
Beaverton, OR
APPLE INC has the following available in Beaverton, Oregon. Physical Design implementation of partitions and develop/test place and route flows. Implement physical design of partitions and…
Added 3 mins ago
System Product Design Engineer
Apple
Cupertino, CA
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work closely with multiple technical and operations disciplines…
Added 3 mins ago
System Product Design Engineer
Apple
Austin, TX
APPLE INC has the following available in Austin, Texas. Develop the next generation of Mac and iPad devices and interact with engineers across many disciplines in the company. Collaborate…
Added 3 mins ago
Physical Design Engineer
Apple
Cupertino, CA
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Contribute to all phases of the physical design of high-performance…
Added 3 mins ago
System Product Design Engineer
Apple
Cupertino, CA
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Lead the end-to-end design and engineering integration of a complex…
Added 3 mins ago
RF/Analog/Mixed Signal Engineer
Apple
Austin, TX
APPLE INC has the following available in Austin, Texas. Generation of Block and Chip-Level Specifications: Defining and documenting functional and performance requirements for blocks and…
Added 3 mins ago
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FE Engineer
Apple
San Diego, CA
- $156,956 to $214,300 USD / year
APPLE INC has the following available in San Diego, California. Microarchitecture definition. RTL design in SystemVerilog/Verilog. IP integration and verification. RTL low-power design and…
Added 3 mins ago
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Design Verification Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Ensure bug-free first silicon for part of the SoC / IP and developing…
Added 3 mins ago
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Power Engineer
Apple
Cupertino, CA
- $207,673 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Model power dissipation and power delivery. Establish voltages for…
Added 3 mins ago
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Design Verification Engineer
Apple
Cupertino, CA
- $187,408 to $225,300 USD / year
Utilizing Hardware description languages including Verilog, SystemVerilog or Verilog-AMS to understand the issues inside digital design and models.
Added 3 mins ago
Telecommunications
Apple
Austin, TX
APPLE INC has the following available in Austin, Texas. Using the trouble-ticket system to lead, track, and resolve Webex/Unified Communications (UC) related trouble tickets. Maintaining…
Added 3 mins ago
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Silicon Validation Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Run bench test and debug of RF Soc IP, including transmitters,…
Added 3 mins ago
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Module Design Engineer
Apple
Cupertino, CA
- $174,149 to $225,300 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Work on new lens designs, characterization and integration into CMOS…
Added 3 mins ago
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Silicon Prototype Engineer
Apple
Cupertino, CA
- $221,374 to $277,600 USD / year
APPLE INC has the following available in Cupertino, California and various unanticipated locations throughout the USA. Responsible for the complete lifecycle of FPGA platforms, from…

SpaceXSI

Sr. Software Engineer, Kernels/CUDA (C++)

Palo Alto, CA, United States
Seattle, WA, United States

$200,000 - $375,000 USD

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Job details

Pay: $200,000 - $375,000 USD
Experience: 5+ years of experience with low-level system programming in C/C++
Posting language: English
Posted: Nov 4, 2026

Original job description

SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.

SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.

SR. SOFTWARE ENGINEER, KERNELS/CUDA (C++)

We 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 SpaceXSI as fast, reliable, and scalable as possible. This 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.

RESPONSIBILITIES:

Design, build, and optimize massive GPU clusters for extreme-scale training and inference workloads
Develop and tune low-level CUDA kernels (GeMM, Attention, etc.), using CUTLASS, Tensor Cores, and Nsight for maximum performance
Profile, debug, and eliminate bottlenecks across GPU memory hierarchy, networking fabric, filesystems, and multi-GPU operation
Collaborate closely with AI research teams to deliver production-grade performance and scalability

BASIC QUALIFICATIONS:

5+ years of experience with low-level system programming in C/C++

PREFERRED SKILLS AND EXPERIENCE:

Deep low-level systems programming (C/C++/PTX/SASS)
Strong experience with large-scale GPU clusters or distributed compute infrastructure at production scale
Hands-on work with GPU kernel optimization (CUTLASS, custom kernels, Nsight profiling)
Track record of building or running high-performance infrastructure for AI workloads (training or inference platforms)
Ability to reason from first principles and optimize for both memory-bound and compute-bound scenarios

COMPENSATION AND BENEFITS:

$200,000 - $375,000 USD

Base salary is just one part of our total rewards package at SpaceXSI, 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. SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

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