Member of Technical Staff Post Training and RL
SpaceXAI builds frontier AI models and products including the Grok conversational assistant and a multimodal developer API.
Funding history
About SpaceXAI
SpaceXAI is a US-based AI company focused on accelerating scientific discovery and understanding the universe through reasoning, voice, image, video, and generative AI systems. Formerly xAI, it was acquired by SpaceX effective February 2, 2026, while continuing to operate the x.ai site and services.
Skills
Candidate Availability
Required and preferred rules are kept separate and reflect the wording in the original posting.
About the Role
You will work on critical post-training and reinforcement-learning challenges, including reward modeling, preference optimization, and reinforcement learning to improve reasoning, truthfulness, and real-world capabilities. You will receive clarity on your first project before an offer.
Requirements
- Believe truth-seeking AI is an important and challenging problem.
- Build useful models through post-training and reinforcement-learning techniques.
- Be a power user of AI models.
Responsibilities
- Work on post-training and reinforcement-learning challenges.
- Develop reward modeling, preference optimization, and reinforcement-learning approaches.
Benefits
- Equity
- Medical coverage
- Vision coverage
- Dental coverage
- 401(k) retirement plan
- Short-term disability insurance
- Long-term disability insurance
- Life insurance
- Discounts and perks