xAI· Model· Palo Alto, CA
Member of Technical Staff - Post-Training and RL
Comp$180,000 – $600,000
Classified Tasks (7)
Automate 0%Augment 71%Human-Only 29%
Augment (5)
AI assists, human decides
Work on post-training machine learning challenges, including developing and improving reward modeling systems
technical
Develop and implement preference optimization systems such as RLHF and DPO
technical
Apply reinforcement learning methods to improve models' reasoning, truthfulness, and real-world capabilities
technical
Perform hands-on engineering and research tasks to develop, train, and evaluate AI models
technical
Communicate concisely and accurately technical knowledge and results with teammates
communication
Human-Only (2)
Requires human judgment
Experiment with and push the boundaries of reinforcement learning and alignment methods
technical
Prioritize tasks to focus on highest-impact post-training and reinforcement learning projects
leadership
Job description
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 .