Jobs in the United States

25+ jobs

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Added 1 min ago
Principal Data Architect
Babel Street
Reston, VA · Somerville, MA
12+ years building data systems, with at least 5 as the lead architect or principal engineer on a large-scale data platform.
Added 1 min ago
Senior Critical Facilities Engineer
US AMR-Jones Lang LaSalle Americas, Inc.
Colorado City, TX
The Critical Facilities Engineer is responsible for delivery of best practice systems and problem resolution on all data center electrical and mechanical infrastructure (UPS, MV electrical…
Added 1 min ago
Lead Engineer (Night) – Critical Environments
US AMR-Jones Lang LaSalle Americas, Inc.
Colorado City, TX
The Lead Engineer - Critical Environments supervises and directs operating engineers in installation, repair, and maintenance of all base building and critical system machinery and…
Added 1 min ago
Critical Environments Operating Engineer
US AMR-Jones Lang LaSalle Americas, Inc.
Richardson, TX · Dallas Fort Worth, TX
Critical Environments Operating Engineer (S3)
Added 1 min ago
Stationary Engineer
US AMR-Jones Lang LaSalle Americas, Inc.
Milpitas, CA
Position: Union Stationary Engineer Reports To: Chief Engineer / Facilities Manager Classification: Union (Union 39)
Added 1 min ago
Operating Engineer
US AMR-Jones Lang LaSalle Americas, Inc.
Phoenix, AZ
As an Operating Engineer at JLL, you will be a technical specialist responsible for the comprehensive operation, maintenance, and repair of critical facility equipment and systems. This…
Added 1 min ago
Operating Engineer
US AMR-Jones Lang LaSalle Americas, Inc.
Phoenix, AZ
As an Operating Engineer at JLL, you will be a technical specialist responsible for the comprehensive operation, maintenance, and repair of critical facility equipment and systems. This…
Added 1 min ago
SC
Senior Software Engineer, Pioneer Desktop
SewerAI Corporation
Remote, United States
- $150,000 to $205,000 USD / year
We're looking for a Senior Software Engineer to develop Pioneer Desktop alongside the Truck team lead. It's an Electron app: our React web app, Pioneer, runs inside a desktop shell that…
Added 2 mins ago
Senior Enterprise Engineer - Salesforce Platform (EAA - STP)
Coinbase
Montpelier, VT
…account management, and billing workflows. As a Senior Enterprise Engineer on this team, you'll design and deliver scalable, secure CRM and billing solutions while integrating Salesforce…
Added 2 mins ago
Sr. Machine Learning Engineer (Remote)
CrowdStrike
Montpelier, VT
CrowdStrike is looking for a Sr. Machine Learning Engineer to join our growing AIDR Engineering Team. You will provide engineering support and solutions to a data science group focused on…
Added 2 mins ago
Software Test Engineer
WCG Clinical
Montpelier, VT
The Software Test Engineer is a member of the Quality Engineering team, responsible for supporting the testing, validation and delivery of WCG namedproducts and systems.The role applies…
Added 2 mins ago
Sr Software Engineer
Cengage Group
Burlington, VT
…with product and design teams in your role as senior software engineer. Together you will focus on improving customer outcomes through frequent stakeholder engagements and data-driven…
Added 2 mins ago
RF PDK LVS Development Engineer - Design Enablment
Global Foundries
Essex Junction, VT
Added 7 mins ago
Product Quality Engineer
DuPont Electronic Materials International, LLC
Marlborough, MA
Qnity is seeking a Product Quality Engineer to join our ST-Litho Quality Team in Marlborough, MA. This role is focused on driving material quality excellence across key product lines while…
Added 7 mins ago
Raw Materials and Scale-Up Scientist/Engineer
DuPont Electronic Materials International, LLC
Marlborough, MA
Qnity Electronics’ Semiconductor Technologies – Lithography (ST Litho) R&D organization is seeking a Raw Materials and Scale-Up (RMS) Scientist/Engineer to join our team in Marlborough, MA.
Added 8 mins ago
Application Engineer IV (E4)
Applied Materials
Santa Clara, CA · Santa Clara
Added 8 mins ago
Staff Yield Engineer
Renesas Electronics
San Jose, CA
We are seeking a Staff Foundry Yield Engineer to join our Foundry Yield Engineering team. The position is responsible for driving yield improvement, supporting new product introduction and…
Added 8 mins ago
Senior Mechanical Engineer (onsite)
York International Corp.
United States
Johnson Controls is hiring a Senior Mechanical Engineer! You will work in the Air Handling Unit (AHU) Product Engineering team that is part of the Applied Equipment Group for Johnson…
Added 8 mins ago
Virtual Complex Chillers Commissioning Projects Support Engineer
Johnson Controls Inc.
United States
Added 8 mins ago
Modeling Engineer
York International Corp.
United States
Johnson Controls’ Data Center Thermal Technology Solutions group is seeking a Research and Advanced Development Engineer. As a member of the modeling team, you will develop and apply…
Added 8 mins ago
Senior Modeling Engineer
York International Corp.
United States
Johnson Controls’ Data Center Thermal Technology Solutions group is seeking a Research and Advanced Development Engineer. As a member of the modeling team, you will develop and apply…
Added 10 mins ago
AP
Senior Automation Scientist/Engineer - Biologics Engineering
AstraZeneca Pharmaceuticals LP Company
Gaithersburg, MD
- $124,000 to $171,000 USD / year
We are seeking a Senior Automation Scientist/Engineer to help drive this transformation by embedding laboratory automation and robotics into our workflows and shaping the future of…
Added 12 mins ago
Data Engineer
Golden State
San Francisco, CA
The Golden State Warriors are looking for an experienced Data Engineer to join the growing Business Strategy and Analytics team. In this role, you will help us achieve our mission of…
Added 12 mins ago
Sr. Software Development Engineer, AWS Transform
Amazon.com Services LLC
Seattle, WA
Added 12 mins ago
Software Development Engineer, Amazon Customer Service
Amazon.com Services LLC
Austin, TX · Seattle, WA
- 1+ years of software development engineer or related occupational experience

SpaceXSI

Sr. Model Engineer, Post-Training & RL

Palo Alto, CA, United States

$180,000 - $600,000 USD

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Job details

Pay: $180,000 - $600,000 USD
Posting language: English
Posted: Nov 2, 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. MODEL ENGINEER, POST-TRAINING & RL

You will work on the most critical post-training and reinforcement learning challenges at any given time - including reward modeling, preference optimization (RLHF/DPO), and RL for improving reasoning, truthfulness, and real-world capabilities.

BASIC QUALIFICATIONS:

Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++
Experience training large models (e.g., pre-training, post-training, fine-tuning, or RL training of neural networks with 1B+ parameters)

PREFERRED SKILLS AND EXPERIENCE:

You believe truth-seeking AI is the most important and challenging problem
You are obsessed about building incredibly useful models through post-training and RL techniques
You are a power user of AI models and eager to push the boundaries of what’s possible with reinforcement learning and alignment methods
If you previously worked on post-training, RLHF, or trained models used by millions of people it’s a big plus, but relevant experience is not required
You take pride in your work and thrive in meritocratic environments

COMPENSATION AND BENEFITS:

$180,000 - $600,000 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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