xAI

Member of Technical Staff - Post-Training and RL

xAI · Palo Alto, CA
Palo Alto, CA $180K–$600K Posted 2026-06-29
Salary
$180K–$600K
Type
Full-time
Experience
8+ yr

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 .

$65K — 10th pctl $230K — 90th pctl
This role’s midpoint $390K vs. market median $130K for Operations roles
+200%
above median
Based on 10,000+ Operations roles with disclosed salary ranges tracked on NewJob.
xAI

xAI

Artificial Intelligence · Series E+ · Palo Alto, USA

Stage & Valuation
Series E+ · $250B
Key Investors
Valor Equity Partners, Andreessen Horowitz, Sequoia Capital
Open roles on NewJob
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Engineering (52) · Operations (40) · Design (3)
xAI builds artificial intelligence models and tools to accelerate human scientific discovery and enhance reasoning capabilities. The company develops AI solutions including the Grok platform to understand complex topics and assist users in exploring information.
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