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RL Training Framework

xAI · Palo Alto

Pay
$180K–$440K
From the posting
Posted
Jul 14, 2026
Tracked open for 104 days
Team
Model
Full-time
xAI hiring
298 open roles
11 in other
PythonRustC++LLMs
Apply on xAI's site → Alert me about roles like this

Typical other pay at xAI: $180K–$440K — median of 6 listed ranges.

Across all startups we track: $146K–$198K for other roles (858 listed ranges).

About the role

SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.


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 SpaceXAI, 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 SpaceXAI, 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.

SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

From xAI's careers page. First seen Jul 15, 2026, last verified Oct 25, 2026.

xAI hiring momentum

Open roles: 298, up 6 (+2%) over the last 30 days.

Jul 15, 2026 · 210Oct 25, 2026 · 298

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