Sr. Model Engineer, Model Training

SpaceX Super Intelligence; Seattle (WA); On-site; USD 180,000 - 600,000; Full time

Benefits offered by this job

Equity

Comprehensive medical, vision and dent

401(k) retirement plan

Disability insurance

Life insurance

Discounts and perks

Job summary

SpaceXSI in Seattle is seeking engineers to advance the Super Intelligence stack, from Colossus to Grok models and the Grok suite of applications. You will write production‑grade code and contribute to models that power millions of users.

The role emphasizes building useful models with meritocratic collaboration, ownership, and a focus on truth‑seeking AI. Competitive base salary plus equity and comprehensive benefits are offered.

Qualifications

• Experience writing production-quality code in Python, PyTorch, JAX, Rust or C++.

Skills

Python

PyTorch

JAX

Rust

C++

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.

BASIC QUALIFICATIONS:

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

PREFERRED SKILLS AND EXPERIENCE:

• Experience training models used by millions of users
• Power user of AI models
• You believe truth-seeking AI is the most important and challenging problem
• You take pride in your work and thrive in meritocratic environments
• You are obsessed about building incredibly useful models

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.

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