Jobs in the United States

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Test Engineer II
Blue Origin Personnel, LLC
United States
…to develop reusable, safe, and low-cost space vehicles and systems within a culture of safety, collaboration, and inclusion. Join our team of problem solvers as we add new chapters to the…
Added 3 mins ago
Northrop Grumman (SkillBridge) - Principal Network Cloud Communications
Northrop Grumman
Redondo Beach · Melbourne · Linthicum Heights · Rolling Meadows
At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our…
Added 3 mins ago
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Northrop Grumman
Oklahoma City
- $17.5 to $39.25 USD / hour
At Northrop Grumman, our employees have incredible opportunities to work on revolutionary systems that impact people's lives around the world today, and for generations to come. Our…
Added 4 mins ago
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Added 4 mins ago
Sentinel Project Change Engineering Section Manager 2 - 14050-1
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Northrop Grumman Defense Systems is seeking a Project Change Engineering Manager 2 for the Strategic Deterrent Systems (SDS) division Engineering and Manufacturing team. This leadership…
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Fraud Analytics Engineer
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- $103,669 to $179,693 USD / year
We're looking for an Analytics Engineer that operates at the intersection of data engineering, infrastructure, and machine learning.
Added 8 mins ago
Principal HVAC Engineer
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…members to develop design criteria, define requirements for the systems, develop conceptual design and preliminary design documents, complete calculations related to sizing and selection…
Added 8 mins ago
Software Development Engineer, US Amazon Dedicated Cloud Security
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As a Software Development Engineer (SDE), you will be responsible for the development, operations, and overall health and security of the critical services we support, providing excellent…
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Software Development Engineer, US Amazon Dedicated Cloud Security
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As a Software Development Engineer (SDE), you will be responsible for the development, operations, and overall health and security of the critical services we support, providing excellent…
Added 9 mins ago
Facilities Support Specialist - Huntsville
Auburn University
Auburn University, AL
…University facilities in Huntsville. The position assists the Campus Engineer with the oversight of facility operations, routine and preventive maintenance, capital improvement activities,…
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 10 mins ago
TT
Founding Full-Stack Engineer
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San Francisco, CA
- $180,000 to $240,000 USD / year
On-site in San Francisco, with a minimum of five days per week on-site.
Added 10 mins ago
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Founding Forward Deployed Engineer
True Talent Solutions Partners
New York, NY
- $180,000 to $250,000 USD / year
On-site, five days per week in New York, New York, United States.
Added 13 mins ago
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Senior Engineer Core Infrastructure
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Salt Lake City, UT · Washington, DC · Orlando, FL · Long Island City, NY
- $105,600 to $150,400 USD / year
The Senior Core Infrastructure Engineer – is focused on ensuring the creation and management of Infrastructure including managing operational stability, performance, and cost-efficiency of…
Added 14 mins ago
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Senior Data Engineer
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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
Senior Terrestrial Mechanical Design Engineer, Controls
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The Senior Mechanical Design Engineer builds bespoke test infrastructure that qualifies spaceflight hardware for orbit. They design, build, and own sophisticated ground support equipment…
Added 14 mins ago
Senior Terrestrial Automation & Controls Engineer
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The Senior Automation & Controls Engineer builds bespoke test infrastructure that qualifies spaceflight hardware for orbit. They design, build, and own sophisticated ground support…
Added 17 mins ago
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Stationary Engineer
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- $76.5 USD / hour
As a Stationary Engineer, you will be a central figure responsible for the safe and efficient operation, maintenance, and repair of our facility's critical mechanical and electrical…
Added 18 mins ago
Engineer sr - Corporate and Manufacturing Networking – Global Technology
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As a Senior Engineer on the Corporate and Manufacturing Network Engineering team, you will own the design, implementation, and operational health of Starbucks' corporate and manufacturing…
Added 18 mins ago
IT Principal Application Security Engineer (Must Reside in Texas)
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All applicants must reside within the state of Texas and have the capability of performing all of the work from their home in Texas · To successfully work from home, employees must have access to a minimum internet connection as noted by RBFCU
Added 18 mins ago
IT Principal SOC Engineer (Must Reside in Texas)
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Added 19 mins ago
Head of Data Engineering
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Added 19 mins ago
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- $120,000 to $160,000 USD / year
…team and leads all operations, strategic planning, capital infrastructure projects, and regulatory compliance for the City's Public Utilities divisions, including Water, Wastewater,…
Added 19 mins ago
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…recognizable mission critical facilities, secure environments, complex infrastructure, and global enterprises. The company’s capabilities include electrical power systems, electronic…

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