Principal Research Engineer, Post-Training is open at Character.AI in Redwood City, CA. The posting gives a salary of $275K - $400K. Posted on Jun 22, 2026, and still on Character.AI’s careers page when we last checked, on Nov 14, 2026.
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…
The opening lines of the posting. The rest is on Character.AI’s careers page.
Hiring at Character.AI
Character.AI has 13 open roles right now. Most are in Engineering and Data & Research. See all its roles
