Member of Technical Staff - Post-Training and RL

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.

$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

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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.