Jobs › US jobs › Principal Research Engineer, Post-Training

Principal Research Engineer, Post-Training

Character · Redwood City, CA · All 13 Character jobs

Employment
Permanent
Level
Lead
Posted
22 Jun 2026

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Required skills, as the advert states them

  • Machine Learning
  • Mentoring
  • LLMs
  • A/B testing
  • Communication Skills

Nice to have

  • Leadership
  • UX design
  • Etl
  • Observability
  • Kubernetes
  • Docker

About this opportunity

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.

Read the full advert and apply on Character's site →

Collected from Character's own careers site (Ashby). Posted 22 Jun 2026. TUNAI shows an excerpt and the facts it read from the advert; the employer's page has the full description and the application.