Product design question
Design a feature that lets developers create custom emotional voice personalities.
- Hume AI
- Product design
- Medium
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What this question tests
Tests product design for a developer facing customization feature, balancing creative flexibility with brand and ethical guardrails.
How to approach it
- Define the developer need: building a voice agent personality that matches their brand or use case, beyond picking from a fixed set of default voices.
- Design the customization dimensions: tone, warmth, energy level, and emotional responsiveness range, exposed as adjustable parameters rather than raw model internals.
- Provide a testing sandbox: let developers preview their custom personality against sample conversations before deploying it to real users.
- Add guardrails on customization: prevent personalities designed to manipulate vulnerable users or impersonate a specific real person without consent.
- Support versioning and iteration: let developers refine a personality over time based on real usage feedback, not just a one time setup.
- Confirm with the interviewer whether the primary customer is an enterprise brand wanting consistency or an individual developer wanting creative range.
What a strong answer includes
- Exposes customization as clear, interpretable parameters like tone and warmth rather than requiring developers to understand model internals, matching Hume's non expert developer audience.
- Includes a preview sandbox against real sample conversations, letting developers validate a personality feels right before it reaches real users.
- Builds in guardrails against manipulative or impersonating personalities specifically, addressing the most likely misuse of a custom emotional voice feature.
- Treats personality design as iterative, supporting versioning as developers learn what resonates with their actual users over time.
Common mistakes
- Exposing raw technical parameters that only a machine learning expert could meaningfully use.
- No guardrail against misuse, like creating a personality designed to manipulate or impersonate someone.
- Treating personality creation as a one time setup rather than something developers should be able to test and refine.
Likely follow-up questions
- How would you prevent a developer from creating a manipulative or coercive personality?
- What would you do if a custom personality performed worse than a default one in testing?
- How would you help a developer without design experience create a personality that feels coherent?
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Learn the skill behind it
Chapters of the AI PM course that teach what this question tests.
- Chapter 4: Discovery and strategy for AI products
- Chapter 7: AI UX and human oversight: design for a system that is wrong sometimes
- Chapter 14: Get the job: the AI PM interview loop