Research Engineer AI Safety and Alignment

Character.AI is an interactive AI-entertainment platform for creating and conversing with Characters.

Menlo Park, United States
About Character.AI

Character Technologies Inc. (dba Character.ai) operates a consumer platform that uses conversational AI to let users create Characters, chat, roleplay, and tell stories.

View jobs by Character.AI

Skills

Candidate Availability

Required and preferred rules are kept separate and reflect the wording in the original posting.

About the Role

You will develop safety and alignment evaluations, research alignment, value-learning, and interpretability techniques, and conduct adversarial testing of large language models. You will analyze and mitigate harmful model behavior using approaches such as RLHF and fine-tuning, write production-facing and training code, and help translate research into scalable solutions.

Requirements

  • PhD or equivalent experience in Computer Science, Machine Learning, or a related field
  • Ability to write clear production-facing and training code
  • Experience working with GPUs for training, serving, and debugging
  • Experience with data pipelines and data infrastructure
  • Strong understanding of transformers and reinforcement learning, including their safety implications

Responsibilities

  • Develop evaluation methodologies and metrics for large language model safety and alignment
  • Research alignment, value-learning, and interpretability techniques
  • Conduct adversarial testing to identify model vulnerabilities and failure modes
  • Analyze and mitigate bias, toxicity, and harmful model behavior using RLHF and fine-tuning
  • Translate safety research into scalable solutions and best practices
  • Contribute to AI safety research through publications and presentations

Benefits

  • Equity
  • Health coverage for employees and their families with most premiums covered
  • 401(k) contribution
  • Paid parental leave of up to 20 weeks
  • Four weeks of PTO
  • Daily in-office catering
  • Monthly DoorDash stipend
  • Monthly wellness stipend