Jobs in the United States

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Added 2 mins ago
ZT
Quality Control Laboratory Technician, Support I
Zebra Technologies
Morris Plains, NJ
- $23 USD / hour
Monitor and report test status of various production runs to QC Manager, Manufacturing Manager, QC Supervisor, Technology, or Process Engineer.
Added 2 mins ago
Senior Test Engineer
ASRC Federal Holding Company
Egg Harbor Township, NJ
ASRC Federal Advanced Research LLC (AFAR) is seeking a Senior Test Engineer to join our Common Support Services - Weather (CSS-Wx) team that supports the Federal Aviation…
Added 3 mins ago
Sr. Antenna Production Engineer
Echodyne Corp
Kirkland, WA
We are seeking an Sr. Antenna Production Engineer to help transition our proprietary antenna technology into manufacturable MESA radar hardware. This role works closely with RF,…
Added 11 mins ago
IG
Software Quality Engineer
Insight Global
Sunset Hills, MO
- $35 to $40 USD / hour
We are seeking a Junior Software Quality Engineer with strong test automation experience and prior hands-on experience applying AI-assisted testing practices. In this role, you will help…
Added 20 mins ago
H
R&D Writing System Engineer
HP
Corvallis
- $93,400 to $143,800 USD / year
…HP’s industry leading print businesses. This Specialist-level engineer primarily supports the PageWide Industrial (PWI) business by leading R&D development and integration of ink and…
Added 21 mins ago
Principal Systems Engineer - FMS
Aerospace
United States
…project. We are on the lookout for a highly experienced Systems Engineer who is passionate about developing and defining software requirements that meet the evolving needs of our…
Added 24 mins ago
Maintenance Engineer (Engineer 1) - MSS Talent Development Program
Los Alamos National Laboratory
Los Alamos, NM
…a career path towards facilities management. Starting as an Engineer I within the Maintenance and Site Services (MSS) Division, you will be provided the opportunity to experience all…
Added 24 mins ago
Materials Science Post-Bachelor's Engineer
Los Alamos National Laboratory
Los Alamos, NM
The MST-8 Materials Scattering Team is seeking a post-bachelor's engineer to support in situ microstructural characterization using neutron and synchrotron X-ray sources. The successful…
Added 24 mins ago
Sr Mechanical Engineer
Leidos
Albuquerque, NM
Leidos Defense Systems is seeking a highly motivated Sr Mechanical Engineer who loves collaboration and being a part of something big, to join our team. This role drives the implementation…
Added 24 mins ago
Senior/Principal Mechanical Engineer - Experimental Solid Mechanics, Onsite
Sandia National Laboratories
Albuquerque, NM
…security! We are seeking a highly motivated R&D Mechanical Engineer to join our dynamic team in the Experimental Solid Mechanics…
Added 24 mins ago
Computing Infrastructure Engineer, System Administrator Network Management & Virtualization Focus, Onsite
Sandia National Laboratories
Albuquerque, NM
We are seeking a motivated and skilled Computing Infrastructure Engineer (CIE) to join our High Security Operations IT Services team. This role supports the full lifecycle management of…
Added 25 mins ago
Senior/Principal Software Solutions Architect - Data Integration Framework, Hybrid
Sandia National Laboratories
Albuquerque, NM
If so, Sandia National Laboratories' Science and Information Engineering System's group is seeking a motivated Software Solution Architect to join the Design and Development Solutions team…
Added 25 mins ago
EG
Quality Assurance Engineer - PHP
Eliassen Group
Santa Fe, NM
- $40 to $50 USD / hour
Our client seeks a results-driven Senior Quality Assurance Engineer to support Policyholder Portal applications. The role requires manual, automation, mobile, API, and database testing…
Added 27 mins ago
Automation & Controls Software Engineer
Enchanted Rock Management LLC
Houston, TX
The Automation & Controls Engineer develops, tests, deploys, and maintains control logic and software for ERock’s power generation and microgrid systems. The role focuses on PLC and RTAC…
Added 31 mins ago
Automation Engineer (Top Secret Clearance Required)
Akima, LLC
North Charleston, SC
As Automation Engineer, you will provide senior-level technical leadership for the design, integration, sustainment, and optimization of networked systems supporting NIWC RDT&E mission…
Added 32 mins ago
Principal Engineer Quality (CMM)
Northrop Grumman
Rolling Meadows
Northrop Grumman Mission Systems is seeking a talented Principal Engineer Quality (CMM) located in Rolling Meadows, IL.
Added 32 mins ago
Sr. Principal DevOps Engineer (AHT) - Position qualifies for sign-on bonus starting at $7k
Northrop Grumman
Aurora · Morrisville · Sacramento
Install, configure, test and maintain operating systems, application software and system
Added 32 mins ago
DevOps Engineer or Principal DevOps Engineer - Position qualifies for sign-on bonus starting at $5k
Northrop Grumman
Aurora · Morrisville · Sacramento
Install, configure, test and maintain operating systems, application software and system management tools.
Added 32 mins ago
Senior Software Engineer
Northrop Grumman
Newport News
Northrop Grumman is seeking a Sr Software Engineer for our GCCS-J program in Newport News, Va.
Added 32 mins ago
Information Systems Engineer Manager 2
Northrop Grumman
Beale AFB
Northrop Grumman Aeronautics Systems has an opening for an Information Systems Engineer Manager 2 to join our team of qualified, diverse individuals within our Aircraft Solutions…
Added 32 mins ago
Staff DevOps Engineer - Position qualifies for sign-on bonus starting at $10k
Northrop Grumman
Aurora · Morrisville · Sacramento
Install, configure, test and maintain operating systems, application software and system management tools.
Added 32 mins ago
Staff Cloud Engineer - Position qualifies for sign-on bonus starting at $10k
Northrop Grumman
Aurora · Morrisville · Sacramento
Install, configure, test and maintain operating systems, application software and system management tools.
Added 32 mins ago
Sentinel - Principal / Sr Principal Systems Engineer - 19282
Northrop Grumman
Roy
Northrop Grumman Defense Systems is seeking a Sr. Principal Systems Engineer. This opening is in Roy, UT and will support the Sentinel Program. Northrop Grumman supports the Air Force’s…
Added 32 mins ago
Resource Control Team Software Engineer (Level 1 or 2) - AHT
Northrop Grumman
Manhattan Beach
Northrop Grumman’s Space Sector is seeking a Software Engineer (Level 1 or 2) to join our team of highly qualified, diverse professionals within the Western Region Software Engineering…
Added 33 mins ago
Design Quality Assurance Engineer III - Endoscopy
Boston Scientific
Marlboro
The Design Quality Assurance Engineer III is responsible for leading complex design-related nonconformance (NCEP) and CAPA activities across the product lifecycle. This individual will work…

SpaceXSI

Sr. Software Engineer, Training/Inference (C++)

Palo Alto, CA, United States
Seattle, WA, 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 experience in C/C++ or Rust
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, TRAINING/INFERENCE (C++)

At SpaceXSI we are building the high-performance inference platform that serves Grok to millions of users every day. As a Software Engineer, Training/Inference (C++), you will design and optimize large-scale model serving systems end-to-end. You will own everything from distributed infrastructure – global KV cache, continuous batching, load balancing, auto-scaling – to deep low-level optimizations, including GPU kernels, quantization, speculative decoding, and tail latency. This is a high-impact role where your work directly determines how fast and reliably users interact with Grok at massive scale.

RESPONSIBILITIES:

Architect and implement scalable distributed infrastructure for model serving (load balancing, auto-scaling, batch scheduling, global KV cache)
Optimize latency and throughput of model inference under real production workloads
Build and operate high-concurrency serving systems with excellent tail latency and high reliability at the scale required to serve millions of users
Benchmark, fine-tune, and accelerate inference engines (including low-level GPU kernel work and code generation)
Develop custom tools to trace, replay, and fix issues across the full stack - from orchestration down to GPU kernels
Create robust CI/CD infrastructure for seamless endpoint deployment, image publishing, and inference engine updates
Accelerate research on scaling test-time compute, RL rollout, and model-hardware co-design for next-generation systems

BASIC QUALIFICATIONS:

Bachelor’s degree in computer science, computer engineering, or science discipline
5+ years of experience with low-level system programming experience in C/C++ or Rust

PREFERRED SKILLS AND EXPERIENCE:

Experience with large-scale, high-concurrent production serving
Experience with GPU inference engines (e.g., vLLM, SGLang, Triton, TensorRT-LLM)
Strong background in system optimizations: batching, caching, load balancing, parallelism
Low-level inference optimizations: GPU kernels, code generation
Algorithmic inference optimizations: quantization, speculative decoding, distillation, low-precision numerics
Experience with testing, benchmarking, and reliability of inference services
Experience designing and implementing CI/CD infrastructure for inference

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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