Member of Technical Staff - RL Inference

xAI|06 Jul 2026

fulltimeonsite

Before you apply

Listed location: Palo Alto, CA

Work arrangement: onsite. A remote label does not confirm worldwide eligibility or visa sponsorship.

Read the employer’s description for qualifications, compensation and work eligibility. Confirm the position is still open on the application page.

Job description supplied by xAI; category and skill labels may be inferred. How our listings work · Report a problem

Job Description

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 with low precision RL training and inference.

RESPONSIBILITIES:

Design and optimize our inference stack for all shapes of RL workloads at SpaceXAI, from small scale ablations to production training runs.
Analyze, profile and address performance bottlenecks in large scale RL systems
Work closely with the modelling team to efficiently implement novel RL techniques and algorithms

BASIC QUALIFICATIONS:

Experience in building, debugging, and optimizing efficiency of large-scale distributed systems
Experience in LLM inference
Proficiency in programming languages such as Python, C++ and/or Rust; frameworks such as PyTorch, Jax, CUDA
Willingness to dive deep and solve hardcore problems at all levels of the stack

PREFERRED SKILLS AND EXPERIENCE:

Strong knowledge in quantization and numerics in LLM inference and training
Experience in developing inference engines, e.g. SGLang, vLLM

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.

Skills mentioned

PythonPyTorchJAXCUDARustLLMC++Distributed Systems

Frequently asked questions

Is the Member of Technical Staff - RL Inference position at xAI remote?

The Member of Technical Staff - RL Inference role at xAI does not have a confirmed remote arrangement in our data. Check the employer description for its work location.

What type of employment is the Member of Technical Staff - RL Inference role?

xAI is hiring for a full-time Member of Technical Staff - RL Inference position.

Which skills are mentioned for the Member of Technical Staff - RL Inference job at xAI?

Detected skill labels include Python, PyTorch, JAX, CUDA, Rust, LLM, C++, Distributed Systems. Check the employer description to distinguish required skills from preferred experience.