Product design question

How can Whatsapp create a feature that enables users to conveniently organize simple single-task events like dinner or a movie night directly within the Whatsapp platform?

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

Product design for a lightweight event-coordination feature within an existing messaging app, avoiding over-building a full calendar product.

Segment users: friend groups who currently coordinate plans through scattered back-and-forth messages, the core inefficiency this feature addresses.
Identify the pain point: deciding on a simple plan gets buried in unrelated messages and requires manual tallying of responses.
Prioritize simplicity and speed over a full calendar tool, since the app's context is casual, spontaneous coordination.
Design the solution: a lightweight in-chat plan card where anyone can propose a time and place and others tap to confirm, pinned at the top of the chat.
Add a reminder layer: an automatic reminder to confirmed participants shortly before the planned time.
Define success: percentage of proposed plans that reach a confirmed outcome and reduction in back-and-forth messages needed to finalize a plan.

Correctly scopes the feature as lightweight and chat-native, avoiding over-building a full calendar product that doesn't fit the casual context.
Proposes a concrete, simple mechanism, a pinned plan card with tap-to-confirm, that fits naturally into existing chat behavior.
Adds a reminder as a small but high-value addition addressing real plan-forgetting friction.
Uses reduction in back-and-forth messages as a clever proxy for the feature actually solving the coordination problem.

Over-building a full calendar or event-management system disconnected from the app's casual, chat-first context.
Not addressing how the plan stays visible and doesn't get buried in an active chat.
Ignoring the reminder aspect, a key reason plans get missed.

How would you handle a plan that keeps getting proposed and re-proposed without resolution?
How would this interact with the app's encryption and privacy model?
How would you measure whether this reduces or increases overall chat volume?