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Senior Mechanical Engineer, Space Hardware
IRPI
Wilsonville, OR
We are looking for a senior mechanical engineer to lead customer projects from scope to delivery, owning the mechanical design of subsystems from requirements through build and test. You…
Added 2 mins ago
Senior Systems Engineer
The Mitre Corporation
Huntsville, AL
Must be based in Huntsville, AL or able to relocate to Huntsville · Must have an active Secret U.S Government issued Security Clearance
Added 2 mins ago
II
Process Engineer
Ingredion Incorporated (NA-US)
Bedford Park, IL
- $84,400 to $112,533.33 USD / year
…improvement within a manufacturing environment. The Process Engineer partners across operations, maintenance, and engineering teams to improve safety, quality, productivity, reliability,…
Added 2 mins ago
Applied AI Health System Engineer [Health Services-Provider] – Senior Manager
PricewaterhouseCoopers Advisory Services LLC
NY · Raleigh, NC · Charlotte, NC · Chicago, IL · Cincinnati, OH · Cleveland, OH · Columbia, SC · Columbus, OH · Dallas, TX · Baltimore, MD · Richmond, VA · Rochester, NY · Rosemont, IL · Boston, MA · St. Louis, MO · Salt Lake City, UT · San Antonio, TX · Seattle, WA · Spartanburg, SC · Stamford, CT · Tampa, FL · Atlanta, GA · Toledo, OH · Austin, TX · Tulsa, OK · Washington, DC · Denver, CO · Des Moines, IA · Detroit, MI · Buffalo, NY · Florham Park, NJ · Fort Worth, TX · Greensboro, NC · Hartford, CT · Houston, TX · Grand Rapids, MI · Jacksonville, FL · Kansas City, MO · Las Vegas, NV · Little Rock, AR · Louisville, KY · Birmingham, AL · Fayetteville, AR · Melville, NY · Miami, FL · Milwaukee, WI · Minneapolis, MN · Nashville, TN · New Orleans, LA · Oklahoma City, OK · Philadelphia, PA · Phoenix, AZ · Pittsburgh, PA · Portland, OR
What You Must Have
Added 3 mins ago
Aerospace Engineer 2 (5221C), Space Sciences Laboratory #89688
University of California, Berkeley
CA
The Aerospace Engineer 2 position requires an equipment, vacuum and test engineer with experience in the development, maintenance and testing of cosmic-chemistry, gamma-ray and ultra-violet…
Added 3 mins ago
Manager Electronics Engineering 3
Northrop Grumman
San Diego
…providing the skills and innovative technologies to develop, design, produce, integrate, test, and sustain optimized product lines across the sector while providing a decisive advantage to…
Added 3 mins ago
Principal / Senior Principal Systems Engineer
Northrop Grumman
Los Angeles
The Engineering & Sciences organization at Northrop Grumman Mission Systems (NGMS) is seeking a Principal or Senior Principal Systems Engineer to join our team based in Woodland Hills, CA.…
Added 3 mins ago
Senior Staff Electromechanical Engineer
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Northrop Grumman Mission Systems (NGMS) is seeking a Senior Staff Electromechanical Engineer with the desire to learn new technologies to join our innovative Hardware Engineering…
Added 3 mins ago
Senior Staff Radar Modeling Simulation & Analysis Systems Engineer
Northrop Grumman
Baltimore
…Baltimore and Partnered Sites (BaPs) Division is seeking a Senior Staff Radar Modeling Simulation & Analysis Systems Engineer to join our team of qualified and diverse individuals. This…
Added 3 mins ago
Principal / Senior Principal Systems Engineer
Northrop Grumman
Los Angeles
…Mission Systems (NGMS) is seeking a highly skilled Principal or Senior Principal Systems Engineer to join our team in Woodland Hills, CA. The ideal candidate will have a strong background…
Added 4 mins ago
Principal/Sr Principal Aeronautical Flight Test Engineer - Loads & Dynamics
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Must have an active US Government Secret clearance (with a background investigation within the past 6 years or enrolled into Continuous Evaluation)
Added 4 mins ago
Staff Engineer Systems
Northrop Grumman
McLean
Must have U.S
Added 4 mins ago
Principal or Senior Principal Manufacturing Engineer
Northrop Grumman
Waynesboro
We are looking for you to join our team as a Principal Manufacturing Engineer or a Senior Principal Manufacturing Engineer to support production and manufacturing operations at our Central…
Added 4 mins ago
EL
Lighting Applications Engineer
Edge Lighting LLC
Chicago, IL
- $25 to $32 USD / hour
Position reports to the Design Engineer and CEO
Added 4 mins ago
Principal Electrical Engineer 3 – Electrical Ground Support Equipment (EGSE)
Northrop Grumman
Chandler
Northrop Grumman Space Systems is currently seeking an experienced Principal Electrical Engineer to join our electrical ground support equipment group in our Chandler, AZ facility. Our…
Added 4 mins ago
Sentinel - Sr Principal Systems Engineer - 18016
Northrop Grumman
Roy
Northrop Grumman Defense Systems is seeking a Principal / Sr. Principal Systems Engineer. This opening is in Roy, UT and will support the Sentinel Program. Northrop Grumman supports the Air…
Added 9 mins ago
Sales Engineer - Chicago (Majors)
Cyera
Chicago, IL
As a high performing Sales Engineer or Senior Sales Engineer, you will work with our prospects and clients to craft enterprise-wide cloud data security and data risk management solutions.…
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Engineer in Charge Senior
Clean Tech, Inc.
Hillsboro, OR
The Senior Engineer in Charge is a critical technical leader within the Applications & Technology department, responsible for advanced oversight of support activities, complex…
Added 10 mins ago
Sr. Software Engineer, Pretraining Data
SpaceXAI
Palo Alto, CA
We're looking for Senior Software Engineers to build and own the data systems behind our frontier models' initial training. You'll work on large-scale crawling, data platform, and pipeline…
Added 11 mins ago
UG
Senior Data Engineer
UnitedHealth Group
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- $91,700 to $163,700 USD / year
These roles include, but are not limited to analysis, design, coding, engineering, testing, debugging, standards, methods, tools analysis, documentation, research and development,…
Added 12 mins ago
GH
Senior Software Engineer
GE HEALTHCARE
Remote, United States
- $109,600 to $164,400 USD / year
As a Senior Software Engineer in GE HealthCare's Science & Technology organization, you will develop scalable, cloud-based software solutions that support healthcare innovation and digital…
Added 14 mins ago
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Senior Data Engineer
Expression
Shirlington, VA
- $180,000 to $200,000 USD / year
Expression is seeking an experienced Senior Data Engineer to design, develop, and integrate secure enterprise data services supporting advanced Artificial Intelligence (AI) and Large…
Added 14 mins ago
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Senior AI Engineer
Expression
Shirlington, VA
- $180,000 to $210,000 USD / year
Expression is seeking experienced Senior AI Engineers to design, develop, integrate, and evaluate advanced Artificial Intelligence (AI) and Large Language Model (LLM) capabilities…
Added 15 mins ago
Test Program Manager, Autonomous Airpower
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Costa Mesa, CA
…will lead the test and evaluation team alongside the Lead Test Engineer to conduct hardware-in-the-loop, software-in-the-loop, system, and subsystem tests in labs, ground test and flight…
Added 15 mins ago
Senior Terrestrial Mechanical Design Engineer, Controls
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El Segundo, CA
The Senior Mechanical Design Engineer builds bespoke test infrastructure that qualifies spaceflight hardware for orbit. They design, build, and own sophisticated ground support equipment…

SpaceXAI

Sr. Software Engineer, Pretraining Data

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 professional software engineering experience building distributed systems and/or large-scale data infrastructure
Posting language: English
Posted: Nov 10, 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, PRETRAINING DATA

We're looking for Senior Software Engineers to build and own the data systems behind our frontier models' initial training. You'll work on large-scale crawling, data platform, and pipeline infrastructure, turning raw dumps into the datasets our models train on, and making iteration with researchers fast and reliable. As a senior engineer, you'll set technical direction for these systems, lead projects across teams, and mentor other engineers as our pretraining data scales.

RESPONSIBILITIES:

Data Platform: Design, build, and scale the distributed infrastructure that transforms raw web, code, multimodal, and acquired data into training-ready datasets for frontier model pretraining. Own high-throughput data pipelines, orchestration systems, and tooling that enable fast, reliable, observable, and reproducible data processing at massive scale, with end-to-end visibility into data lineage, freshness, and pipeline health.
Data Quality: Build and deploy high-performance models and algorithms to classify, rank, deduplicate, filter, and clean training data at extreme throughput. Design and execute rigorous experiments across data mixtures, sampling strategies, and quality thresholds to quantify their impact on training loss, downstream evaluations, and model capabilities, translating research findings into production systems.
Crawling: Build and optimize large-scale web crawling infrastructure spanning URL discovery, prioritization, host scheduling, fetching, parsing, and content extraction. Improve crawl coverage, efficiency, and reliability through intelligent scheduling, anti-bot resilience, robust extraction systems, and automated recovery, ensuring high-quality web data flows seamlessly into downstream training pipelines.
Technical Leadership & Collaboration: Lead complex engineering initiatives across Data Platform, Data Quality, Crawling, Acquisition, and model training teams. Influence technical direction, drive architectural decisions, mentor engineers, and translate improvements in data infrastructure, coverage, and quality into measurable gains in model performance.

BASIC QUALIFICATIONS:

5+ years of professional software engineering experience building distributed systems and/or large-scale data infrastructure

PREFERRED SKILLS AND EXPERIENCE:

Strong infrastructure or data platform background, ideally with a spike of outlier depth
High-slope engineer who has moved unusually fast (e.g., staff-level ownership within a few years) or brings relevant domain experience
Able to architect and ship end-to-end with high ownership, debug complex systems independently, and work alongside AI agents
Strong intuitions about large-scale distributed systems, including running them reliably at frontier scale
Track record of leading technical projects across teams and mentoring other engineers
Excited to learn how pre-training data shapes model quality, and want the ownership and visibility that comes with building systems that feed frontier training runs

ADDITIONAL REQUIREMENTS:

Onsite role: must be able to work in person at the Palo Alto office

COMPENSATION AND BENEFITS:

The annual compensation range for this role is listed below.

Annual Salary:

$220,000 - $357,000 USD

Your actual level and base salary will be determined on a case-by-case basis and may vary based on the following considerations: job-related knowledge and skills, education, and experience.

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.

Work requirements

Jobs in the United States