Jobs in the United States

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Sr. Customer Support Engineer
Celona Inc
United States
- $100,000 to $120,000 USD / year
Celona is seeking a Sr. Support Engineer to provide pre- and post-sales technical support to customers, sales teams, and partners for Celona LTE/5G solutions. This is a hands-on support…
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Operations Engineer (Starshield)
SpaceX
Hawthorne, CA
Added 1 min ago
Marketing Lead, Claude Frontier Academy
Anthropic
San Francisco, CA · New York City, NY
…of 2027. The Academy’s first program, the Frontier Deployed Engineer (FDE) Residency, brings engineers from leading customers and partners together in cohorts, and more programs will…
Added 1 min ago
Controls Engineering Intern/Co-Op
Dematic Corp. (ILD-US)
Grand Rapids, MI
Chart your path! Whether you are an engineer, customer service agent, supply chain expert, or salesperson, Dematic has a role for you.
Added 1 min ago
Software Engineering Manager II, Site Reliability Engineering, Infra Bigtable SRE
Google
New York, NY
To learn more: check out our books on Site Reliability Engineering or read a career profile about why a Software Engineer chose to join SRE.
Added 1 min ago
Associate Substation Project Engineer
Pacific Gas And Electric Company
Oakland, CA
This is an entry-level Project Engineer job that works under the general technical direction of more experienced engineers. This job is responsible for providing technical engineering…
Added 1 min ago
Equipment Operator
Stronghold Engineering
Coalinga, CA
…shovels, graders or related equipment. Cuts and grades areas to engineer…
Added 1 min ago
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Senior AI Engineer - Finance
Bechtel Corporation
Washington, DC
- $140,800 to $203,700 USD / year
Bechtel is seeking a Senior AI Engineer – Finance to serve as a hands-on technical leader within the Finance Transformation and AI team, responsible for architecting, building, and scaling…
Added 1 min ago
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AI Engineer - Finance
Bechtel Corporation
Washington, DC
- $106,900 to $178,500 USD / year
We are seeking an AI Engineer – Finance to join the Finance Transformation and AI team, focused on designing, building, and deploying production-grade AI and automation solutions that…
Added 1 min ago
AI Engineer - Finance
Bechtel Corporation
Glendale, AZ
We are seeking an AI Engineer – Finance to join the Finance Transformation and AI team, focused on designing, building, and deploying production-grade AI and automation solutions that…
Added 2 mins ago
Principal Security Engineer
Crux AI
Palo Alto, CA
You will be the first security engineer at Crux and the architect of how our platform protects customer workloads, from hardware root of trust to the tenant boundary. Reporting within our…
Added 2 mins ago
Principal AI Ops Engineer
Crux AI
Palo Alto, CA
Added 2 mins ago
Quality Principal Engineer I
Zimmer, Inc.
Warsaw, IN
Certification as a quality engineer (e.g. CQE) or the Reliability Engineer Certification (CRE) granted through the American Society of Quality (ASQ) preferred.
Added 2 mins ago
Senior CI/CD & Infrastructure Automation Engineer
Hitachi Global
San Jose, CA
Added 3 mins ago
Applications Engineer New College Grad- Bachelor's/Master's (Santa Clara/Austin)
Applied Materials, Inc
Santa Clara, CA · Austin, TX
Added 3 mins ago
Product Quality & Reliability Engineer IV - (E4)
Applied Materials, Inc
Santa Clara, CA
As a Product Quality and Reliability Engineer you will part of Semiconductor Products Group (SPG) Quality group supporting Imaging and Process Control (IPC) Business Unit. You will be part…
Added 3 mins ago
HW Qual and DST Engineer
Applied Materials, Inc
Albany, NY
Added 3 mins ago
Application Engineer IV (E4)
Applied Materials, Inc
Santa Clara, CA
Added 3 mins ago
GPS Engineer
Applied Materials, Inc
Santa Clara, CA
Added 3 mins ago
ERP Business Systems Engineer (Infor SyteLine)
Stored Energy Systems
Longmont, CO
The ERP Business Systems Engineer will serve as a hands-on technical and functional leader for SENS’s Infor SyteLine environment. This role will work alongside the existing ERP team members…
Added 3 mins ago
Cloud Java Backend Engineer
SCI SOLUTIONS GLOBAL
Jersey City, NJ
Cloud Java Backend Engineer – Distributed Data Platforms
Added 3 mins ago
Backend Engineer – Java or Python & AWS
SCI SOLUTIONS GLOBAL
Jersey City, NJ
seeking a Cloud Native Backend Engineer with strong Java or Python development
Added 3 mins ago
Senior Engineer, Mechanical - Fixed Equipment & Piping Integrity
Calcasieu Pass Operations LLC
United States
Senior Engineer, Mechanical - Fixed Equipment & Piping IntegrityLocated:
Added 3 mins ago
Sub Fabrication Office Engineer
Schuff Steel
Lindon, UT
The Sub-Fabrication Office Engineer supports the administration and coordination of outsourced fabrication activities. The position prepares purchase orders and change orders, coordinates…
Added 3 mins ago
Engineer, Electrical
Plaquemines LNG Operations LLC
Plaquemines Parish, LA
We are seeking a Engineer, Electrical to join our Plaquemines Facility Team in Louisiana.

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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