Member of Technical Staff - Post-Training and RL

xai· Model
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📍 Palo Alto, CA

About this role

ABOUT xAI

xAI’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:

  • You will work on the most critical post-training and reinforcement learning challenges at any given time — including reward modeling, preference optimization (RLHF/DPO), and RL for improving reasoning, truthfulness, and real-world capabilities.
  • You will get clarity on your first project before an offer.

BASIC QUALIFICATIONS:

  • You believe truth-seeking AI is the most important and challenging problem.
  • You are obsessed about building incredibly useful models through post-training and RL techniques.
  • You are a power user of AI models and eager to push the boundaries of what’s possible with reinforcement learning and alignment methods.
  • If you previously worked on post-training, RLHF, or trained models used by millions of people it’s a big plus, but relevant experience is not required.
  • You take pride in your work and thrive in meritocratic environments.

COMPENSATION AND BENEFITS:

$180,000 - $600,000 USD

Base salary is just one part of our total rewards package at xAI, 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.

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

Frequently Asked Questions

Is the salary disclosed for the Member of Technical Staff - Post-Training and RL position at xai?
The salary for this Member of Technical Staff - Post-Training and RL role at xai is not publicly listed. Click "Apply Now" to learn more about the compensation package on their official careers page.
Where is the Member of Technical Staff - Post-Training and RL position at xai located?
This Member of Technical Staff - Post-Training and RL role at xai is based in Palo Alto, CA. The position is listed as on-site or hybrid. Check the full job description or apply directly to confirm the work arrangement.
Which team or department does the Member of Technical Staff - Post-Training and RL at xai belong to?
This Member of Technical Staff - Post-Training and RL position is part of the Model department at xai. See the full job description for more information about the team structure and responsibilities.
How do I apply for the Member of Technical Staff - Post-Training and RL position at xai?
Click the "Apply Now" button on this page. You will be redirected to xai's official application portal hosted on greenhouse where you can submit your application directly.
When was the Member of Technical Staff - Post-Training and RL job at xai posted?
This Member of Technical Staff - Post-Training and RL position at xai was posted on Apr 28, 2026. Apply as soon as possible — early applications are often reviewed first.
Member of Technical Staff - Post-Training and RL
xai
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