Jobs in the United States

25+ jobs

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Added 3 mins ago
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Electrical Design Engineer
GPAC
Summerville, SC
- $90,000 to $125,000 USD / year
Highly competitive salary and performance bonuses.
Added 3 mins ago
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Electrical Design Engineer
GPAC
Sumter, SC
- $90,000 to $125,000 USD / year
Highly competitive salary and performance bonuses.
Added 3 mins ago
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Electrical Design Engineer
GPAC
Goose Creek, SC
- $90,000 to $125,000 USD / year
Highly competitive salary and performance bonuses.
Added 3 mins ago
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Electrical Design Engineer
GPAC
Florence, SC
- $90,000 to $125,000 USD / year
Highly competitive salary and performance bonuses.
Added 3 mins ago
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Electrical Design Engineer
GPAC
Spartanburg, SC
- $90,000 to $125,000 USD / year
Highly competitive salary and performance bonuses.
Added 8 mins ago
Sr Validation Engineer (RF, mmWave & Mixed-Signal) - TeraWave
Blue Origin Personnel, LLC
San Diego, CA · Cupertino, CA
…interfaces. As a Senior RF/mmWave & Mixed-Signal Validation Engineer, you prove that silicon works on the bench. You bring up first samples, characterize RF and mixed signal performance…
Added 8 mins ago
Software Engineer II - TeraWave
Blue Origin Personnel, LLC
Cupertino, CA
We are seeking a Software Engineer to join our PoP development team which is the high-performance, fast-path software that powers the TeraWave Point of Presence (PoP).
Added 25 mins ago
Software Development Engineer II, KMS
Amazon Development Center U.S., Inc.
Seattle, WA
…directly impacts millions of customers? As a Software Development Engineer II at Amazon, you will design, implement, and deliver features across the full software development lifecycle. You…
Added 28 mins ago
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Senior Software Engineer (Quality, Health Records)
Whoop
Boston, MA
- $150,000 to $215,000 USD / year
At WHOOP, we're on a mission to unlock and inspire performance for life. WHOOP empowers members to perform at a higher level through a deeper understanding of their bodies and daily lives.
Added 29 mins ago
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Lead Principal Software Engineer, Core Infrastructure
Oracle
Nashville, TN
- $146,300 to $306,400 USD / year
…services, NICs, SmartNICs, ILOMs, and GPUs. The team builds high performance, scalable services and tooling that launch, configure, test, and validate server platforms across OCI’s massive…
Added 31 mins ago
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Workday Adaptive Planning Engineer
Eliassen Group
Montpelier, VT
- $65 to $75 USD / hour
Our client is seeking a Workday Adaptive Planning Engineer to design, build, and maintain financial planning and forecasting solutions. The role partners with FP&A, Accounting, and Finance…
Added 31 mins ago
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Quality Assurance Engineer - PHP
Eliassen Group
Montpelier, VT
- $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 33 mins ago
Mechatronics Engineer III
JPL/NASA
Pasadena, CA
You will be working as a Mechatronics Engineer within the Mechanical Engineering, Integration, and Test Section, which leads the design, analysis, development, integration, and test of…
Added 35 mins ago
Aerodynamicist
Ford
Long Beach, CA · Long Beach
Ford's Aerodynamics team is looking for an exceptional, well rounded, Aerodynamics Engineer to grow our capabilities and help us accelerate the world's transition to sustainable energy. You…
Added 36 mins ago
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Construction Technician / Resident Engineer - Municipal
GPAC
Itasca, IL
- $65,000 to $95,000 USD / year
…Chicago suburbs, is seeking a Construction Technician / Resident Engineer to represent its municipal clients in the field on public works…
Added 42 mins ago
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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 43 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 1 hour ago
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R&D Writing System Engineer
HP
Corvallis
- $93,400 to $143,800 USD / year
Develop test methods and laboratory capabilities for image quality, durability, reliability, and jettability; correlate testbed results with press performance and define and execute…
Added 1 hour 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 1 hour ago
Mechanical Facility Systems Engineer 2/3
Los Alamos National Laboratory
Los Alamos, NM
This position will be filled at either the Engineer 2 or 3 level, depending on the skills of the selected candidate. Additional job responsibilities (outlined below) will be assigned if the…
Added 1 hour ago
Sr Electrical Engineer
Leidos
Albuquerque, NM
Act as a certified test conductor or lead verification engineer to establish comprehensive system-level test plans, environmental stress screening, HWIL integration, and launch-readiness…
Added 1 hour ago
W80-4 Weapon Systems Engineer - W80-4 Life Extension Program Team, Onsite
Sandia National Laboratories
Albuquerque, NM
We are seeking an experienced Weapon Systems Engineer (WSE) (R&D Systems Engineer) to join the W80-4 Life Extension Program. The WSE is a key interface between Product Realization Teams…
Added 1 hour ago
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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 1 hour ago
EG
Workday Adaptive Planning Engineer
Eliassen Group
Santa Fe, NM
- $65 to $75 USD / hour
Our client is seeking a Workday Adaptive Planning Engineer to design, build, and maintain financial planning and forecasting solutions. The role partners with FP&A, Accounting, and Finance…
Added 1 hour ago
Automation & Controls Software Engineer
Enchanted Rock Management LLC
Houston, TX
…long-duration reliability, low local emissions, and scalable performance to meet the evolving energy demands of today and…

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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