Member of Technical Staff - RL Training Framework

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

Benefits offered by this job

Equity

Medical coverage

Vision coverage

Dental coverage

401(k) plan

Disability insurance

Life insurance

Job summary

SpaceXSI is hiring for a Member of Technical Staff to build the RL training framework that powers our Grok models and related applications. You will design systems supporting all RL workloads, from ad-hoc experiments to production training runs, and work to optimize performance, scalability, and observability across the stack.

Join a team that combines cutting-edge AI research with production-grade engineering.

Qualifications

• Experience building, debugging, and optimizing large-scale distributed systems.
• Comfortable solving problems across the stack and unfamiliar domains.
• Proficiency in Python, Jax, Rust, and/or C++.

Responsibilities

• Design and implement the systems backing all RL workloads from small-scale ablations to production training runs.
• Profile, debug, and optimize end-to-end training performance.
• Improve scalability and observability of the RL stack.

Skills

Distributed systems

Python

Jax

Rust

C++

Tools

Python

Jax

Rust

C++

Job description

Member of Technical Staff - RL Training Framework

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.

ABOUT THE ROLE:

The RL infrastructure team is looking for an engineer to help develop our RL training framework.

RESPONSIBILITIES:

• Design and implement the systems backing all RL workloads at SpaceXSI, from small scale ablations to production training runs.
• Profile, debug, and optimize end-to-end training performance
• Improve scalability and observability of the RL stack

BASIC QUALIFICATIONS:

• Experience building, debugging, and optimizing efficiency of large-scale distributed systems
• Comfortable diving into unfamiliar areas and solving problems at all levels of the stack
• Proficiency in Python, Jax, Rust, and/or C++

PREFERRED SKILLS AND EXPERIENCE:

• Experience with large scale LLM training infrastructure
• Strong knowledge of reinforcement learning techniques
• Experience with RL numerics

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.