Cantina Labs
Prompt Engineer
Los Angeles
Sponsorship not specified$150k-$180kDetected 175 days ago
PythonExpressMachine LearningData EngineeringLLMsA/B TestingResearchCommunicationCollaboration
About the role
- As a Prompt Engineer at Cantina Labs, you will operate at the frontier of social generative AI-shaping how millions of users experience storytelling, and connection through AI characters.
- This role bridges research and product, pairing rigorous prompt engineering with strategic reasoning about model behavior and user experience.
- Your work will directly impact the consistency, expressiveness, and realism of Cantina's AI characters at scale.
Responsibilities
- Identify key personality traits that make AI personas compelling, and create datasets and prompt structures that reliably reproduce those traits.
- Collaborate with research to build and maintain behavioral evaluations that measure bot performance, personality fidelity, and interaction quality over time.
- Partner with product, design, and engineering to translate creative intent and user feedback into scalable prompt systems.
- Track emerging issues in bot behavior, prioritize improvements, and drive prompt-level solutions in ambiguous or high-impact areas.
- Document model quirks, prompting strategies, and guidelines to scale prompt development across teams.
- Support research and ML in our training efforts by delivering meta-prompts for our synthetic data pipelines and evaluating new model behavior
- Deep understanding of LLM capabilities, limitations, and quirks, with strong intuition for how input design shapes model behavior.
Requirements
- 3+ years of experience prompt engineering and developing LLM-based features end-to-end.
- Strong experience writing, testing, and iterating on complex multi-step and system-level prompts.
- Experience creating datasets and evaluating model outputs in collaboration with ML or product teams.
Compensation
- The anticipated annual base salary range for this role is between $150,000-$180,000.
- When determining compensation, a number of factors will be considered, including skills, experience, job scope, location, and competitive compensation market data.
Benefits
- Competitive salary and generous company equity
- Medical, dental, and vision insurance - 99.99% of premiums covered by Cantina
- 42 days of paid time off, including:
- Generous parental leave & fertility support
- 401(k) retirement savings plan
- One Medical membership, and more!
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This listing is sourced directly from Cantina Labs's careers page and normalized into a canonical job model.