About the Role

• Operate at the frontier of social generative AI to shape user experience through AI characters.
• Collaborate with product, design, and engineering teams to develop engaging, scalable, and realistic AI character prompts.
• Own prompt systems, datasets, and evaluation frameworks powering Cantina's platform.
• Bridge research and product with strategic reasoning about model behavior and user experience.
• Shape how bots think, speak, and act balancing short-term product needs and long-term goals.
• Directly impact consistency, expressiveness, and realism of AI characters at scale.

What You9ll Do

• Define and author behavior system prompts shaping bot personality, emotion, dialect, and social behavior across text, voice, image, and video.
• Identify personality traits making AI personas compelling and create datasets and prompt structures replicating those traits.
• Prototype new bot traits and product features through prompt engineering with iterative evaluation.
• Balance feature development with behavioral consistency and quality across the ecosystem.
• Collaborate with research on behavioral evaluations measuring bot performance and quality.
• Partner with product, design, and engineering to translate creative intent and feedback into scalable systems.
• Review and refine prompts advancing to production, establishing best practices.
• Track and improve emerging bot behavior issues, driving prompt-level solutions.
• Document prompting strategies and guidelines to scale prompt development across teams.
• Support research and ML by delivering meta-prompts and evaluating new model behavior.

What You9ll Bring

• 3+ years of experience in prompt engineering and LLM feature development end-to-end.
• Strong skills in writing, testing, and iterating complex multi-step and system prompts.
• Deep understanding of LLM capabilities, limitations, and input design impact on behavior.
• Experience creating datasets and evaluating model outputs collaboratively with ML/product teams.
• Strong grounding in psychology, sociology, linguistics related to personality and behavior.
• Methodical, hypothesis-driven experimentation and iteration approach.
• Ability to manage multiple initiatives independently in fast-paced environments.
• Excellent communication for technical and non-technical stakeholders.
• Comfortable engaging with executive-level stakeholders.
• Basic familiarity with Python and navigating unfamiliar codebases.