Product design question

How would you design a washing machine for blind people?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Accessible product design: designing a common household appliance for users who cannot rely on visual interfaces.

Identify the core needs of a blind user: selecting the right cycle, confirming settings without reading a screen, and knowing when the cycle is done.
Design for non-visual input: tactile buttons with distinct shapes or braille labels instead of a flat touchscreen.
Design for non-visual feedback: audio cues confirming each setting selected and a spoken or distinct chime when the cycle finishes.
Consider integration with existing accessibility tools, like compatibility with a smartphone screen reader for advanced settings.
Define success as successful independent cycle completion rate among blind users in usability testing.

Replaces the default touchscreen assumption with tactile and audio feedback as the primary interface, not an add-on.
Names a concrete mechanism, like distinct tactile bumps per cycle button and a spoken confirmation of the selected setting.
Considers smartphone integration for more complex settings, leveraging existing accessibility infrastructure like VoiceOver.
Uses an assumed metric, e.g. targeting 95 percent successful independent cycle completion in usability testing.

Designing a standard touchscreen interface with only minor tweaks for accessibility.
Ignoring feedback for cycle completion, leaving the user unsure when the wash is done.
Not testing with actual blind users before finalizing the design.

How would you test this design with actual blind users?
How would you handle error states, like an unbalanced load, non-visually?
How would you balance this design with the needs of sighted users of the same product?