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

Medical, Vision & Dental

401(k) retirement plan

Equity

Disability & Life Insurance

Job summary

SpaceXSI is seeking an engineer to help develop our RL training framework within the RL infrastructure team. You will design and implement systems underpinning all RL workloads, from ablations to full-scale production runs, and work to profile, debug, and optimize training performance.

You will also enhance scalability and observability across the RL stack. The role emphasizes building robust, distributed systems and requires comfort with cross-stack challenges.

Qualifications

• Experience building, debugging and optimizing large-scale distributed systems.
• Ability to tackle problems across the entire stack and learn new areas quickly.
• Proficiency in Python, Jax, Rust and/or C++.

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.

Skills

Distributed systems

Python

C++

Rust

Jax

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.

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.