Member of Technical Staff - Post-Training and RL

Join xAI's mission to create AI systems that understand the universe and aid humanity. This role focuses on critical post-training and reinforcement learning challenges, including reward modeling and preference optimization. You will contribute directly to engineering excellence in a flat, meritocratic organization.

• Work on critical post-training and reinforcement learning challenges
• Focus on reward modeling, preference optimization (RLHF/DPO)
• Improve AI reasoning, truthfulness, and real-world capabilities
• Contribute directly to the company's mission
• Thrive in a flat, meritocratic, and engineering-focused environment