Key facts
- Location
- Redwood City, CA, United States
- Workplace
- Not stated
- Pay
- $275,000–$400,000 a year
- Contract
- Full-time
- Detected
- 3 Nov 2026
- Posted
- 22 Jun 2026
About the role
About the Role and Team As a Principal Research Engineer on the Post-Training team, you will drive the technical vision, execution, and evolution of the systems that transform foundation models into intelligent, engaging, and aligned products. Specifically, your team focuses on post-training of top-tier OSS LLMs (such as Mistral and Qwen) to power the highly immersive role-playing chat features of Character.AI http://Character.AI. You will lead initiatives spanning data, algorithms, infrastr
The full description is on Character.AI’s careers site (opens in a new tab).