Sr. Model Engineer, Mid-training

SpaceXSI; Palo Alto (CA); On-site; USD 180,000 - 440,000; Full time

Benefits offered by this job

Equity

Medical, Vision, and Dental benefits

401(k) retirement plan

Disability insurance

Job summary

SpaceXSI is building the next generation of Super Intelligence to help humanity understand the universe. Our teams are creating a full stack—from Colossus supercomputers to Grok models and applications like Grok Bot and Grok Imagine—aimed at powering more capable AI systems.

As part of our engineering team, you will scale synthetic data to trillions of tokens, distill model intelligence into compact flash models, optimize mid-training data mixtures, and design robust evaluation for mid-training

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).

Responsibilities

• Scale synthetic coding data to trillions of tokens with large-scale docker verification
• Distill the intelligence of flagship models into flash models through synthetic data generation
• Optimize mid-training data mixtures to boost the ceiling for RL
• Develop robust and diverse evaluation for mid-training checkpoints

Skills

Python

PyTorch

JAX

Rust

C++

Production-quality code

Tools

Spark

Ray

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.

RESPONSIBILITIES:

• Scale synthetic coding data to trillions of tokens with large-scale docker verification
• Distill the intelligence of flagship models into flash models through synthetic data generation
• Optimize mid-training data mixtures to boost the ceiling for RL
• Develop robust and diverse evaluation for mid-training checkpoints

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:

• Familiarity across all kinds of scaling laws
• Strong ability to design ML experiments
• Familiarity with state-of-the-art techniques for curating AI training data for text, image, audio, and video modalities
• Strong engineering abilities in large-scale data processing frameworks
• Experience with ML and large model scaling
• Experience with Spark, Ray, and other large-scale data processing frameworks

COMPENSATION AND BENEFITS:

$180,000 - $440,000 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.