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Waste Water Engineer
GPAC
Bangor, ME
- $80,000 to $100,000 USD / year
We are seeking a Water/Wastewater Engineer to join a growing, multi-disciplinary engineering consulting firm. This individual will contribute to the planning, design, and delivery of…
Added 1 min ago
Senior AI Engineer, Banking Technology
Citibank, N.A.
United States
Citi’s Banking Technology organization is seeking a highly hands-on Senior AI Engineer to design, build, and deploy cutting‑edge AI solutions for Investment, Corporate, and Commercial…
Added 2 mins ago
Civil Structural Engineer
GPAC
Dallas, TX
We are seeking a Structural Design Engineer to join our growing team. This role offers the opportunity to participate in every phase of structural engineering projects, from preliminary…
Added 2 mins ago
Civil Structural Engineer
GPAC
Chicago, IL
We are seeking a Structural Design Engineer to join our growing team. This role offers the opportunity to participate in every phase of structural engineering projects, from preliminary…
Added 4 mins ago
AC
Cost Engineer
Aston Carter
Costa Mesa, CA
- $75 to $85 USD / hour
Cost Engineer (Sustainment & Lifecycle Cost Modeling)
Added 4 mins ago
Senior Cloud Cybersecurity Engineer (DoD ATO/RMF)
Unity Technologies Corp LLC
Myersville, MD
…clients. Job Overview We are seeking a Senior Cloud Cybersecurity Engineer (DoD ATO/RMF) to join our team. You will design, assess, and strengthen secure cloud-hosted IT environments…
Added 4 mins ago
Quality Engineer / Principal Quality Engineer 2/3
Northrop Grumman
Elkridge, MD
Northrop Grumman Mission Systems (NGMS) is currently seeking a Quality Engineer / Principal Quality Engineer 2/3 to join our team in Elkridge, MD at our Troy Hill facility.
Added 4 mins ago
Principal/Senior Principal Systems Engineer (AHT)
Northrop Grumman
Linthicum Heights, MD
Northrop Grumman Space Systems (NGSP) is seeking an experienced Principal/Senior Principal Systems Engineer supporting our Advanced Tactical Missions Business Unit (BU) to support a program…
Added 4 mins ago
Manager Information Technology 3
Northrop Grumman
Linthicum Heights, MD
Added 4 mins ago
Space Flight Operations Engineer Systems (AHT)
Northrop Grumman
Linthicum Heights, MD
Northrop Grumman Space Systems in Linthicum, Maryland is seeking an early-career engineer to support on-orbit operations and maintenance (O&M) for a constellation of Space RADAR satellites.
Added 4 mins ago
Logistics Engineer / Principal Logistics Engineer
Northrop Grumman
Linthicum Heights, MD
Northrop Grumman Mission Systems is looking for you to join our team as a Logistics Engineer or Principal Logistics Engineer based out of Baltimore, MD.
Added 4 mins ago
Principal/Sr Principal Systems Engineer
Northrop Grumman
Linthicum Heights, MD
Performs system engineering, integration, verification and validation, for total systems. Work is performed at all levels of total system product to include: concept, design, test,…
Added 4 mins ago
Staff Agile Product Owner - Morrisville (TS/SCI)
Northrop Grumman
Linthicum Heights, MD
…teams to implement high-level business goals across a Ground System product line supporting multiple…
Added 4 mins ago
Sr Principal Agile Product Owner - Morrisville (TS/SCI)
Northrop Grumman
Linthicum Heights, MD
…teams to implement high-level business goals across a Ground System product line supporting multiple…
Added 4 mins ago
Sr Staff Cyber Systems Engineer
Northrop Grumman
Jessup, MD
Northrop Grumman Mission Systems Mission Defense Cyber Team has an opening for a senior systems engineer in the Cyber specialty discipline. As a senior Cybersecurity Systems Engineer (CSSE)…
Added 4 mins ago
Embedded Software Engineer II
Wabtec Corporation
Germantown, MD
…Control Equipment. In this role, the Senior Embedded Software Engineer will work with a cross-functional Engineering team to design and develop new functionalities, as well as maintaining…
Added 4 mins ago
C5ISR Engineer
UIC Government Services and the Bowhead Family of Companies
Aberdeen, MD
Bowhead is looking for a Foreign Military Sales (FMS) Engineer to join the Security Assistance Management Directorate (SAMD) effort located in APG,MD. The Engineer shall provide C5ISR…
Added 5 mins ago
Senior Geothermal Consultant Job Details | Black & Veatch Family of Companies
Black & Veatch
Gaithersburg, MD
Support Owner’s Engineer / Independent Engineer scopes through disciplined technical review.
Added 5 mins ago
Senior Systems Engineer
CACI International
Fort Meade, MD
…that support national security objectives. As a Senior Systems Engineer, you will lead complex engineering initiatives throughout the entire system lifecycle, from concept development and…
Added 5 mins ago
DevOps Engineer (Hybrid) - 31013
Huntington Ingalls Industries
Fort Meade, MD
Seeking a highly motivated and experienced DevOps Engineer to join our fast-paced team. The ideal candidate will have strong working knowledge in Kubernetes and Container Orchestration,…
Added 5 mins ago
DevOps Engineer - $20K Sign On Bonus - 31011
Huntington Ingalls Industries
Fort Meade, MD
Seeking a highly motivated and experienced DevOps Engineer to join our fast-paced team. The ideal candidate will have strong working knowledge in Kubernetes and Container Orchestration,…
Added 5 mins ago
Senior Hardware Engineer - Cross Domain Solutions (SME)
CACI International
Fort Meade, MD
Job Title: Senior Hardware Engineer - Cross Domain Solutions (SME)
Added 5 mins ago
Sentinel - Principal / Sr Principal Systems Engineer - 19242*
Northrop Grumman
Roy, UT · Roy
Northrop Grumman Defense Systems is seeking a Principal Systems Engineer/Sr. Principal Systems Engineer. This opening is in Roy, UT and will support the Sentinel Program. Northrop Grumman…
Added 5 mins ago
Sentinel - Staff Systems Engineer - Lab Test Capability Lead
Northrop Grumman
Roy, UT · Roy
Northrop Grumman Defense Systems is seeking a Staff Systems Engineer - Lab Test Capability Lead to join the Sentinel Systems Engineering team located in Roy, UT. Northrop Grumman supports…
Added 5 mins ago
DevOps Engineer - $20K Sign On Bonus - 31012
Huntington Ingalls Industries
Fort Meade, MD
Seeking a highly motivated and experienced DevOps Engineer to join our fast-paced team. The ideal candidate will have strong working knowledge in Kubernetes and Container Orchestration,…

SpaceXSI

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

Palo Alto, CA, United States

$220,000 - $357,000 USD

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Job details

Pay: $220,000 - $357,000 USD
Experience: 5+ years of experience with low-level system programming in C/C++
Posting language: English
Posted: Nov 5, 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:

$220,000 - $357,000 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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