Product design question

Design a product to help people buy cars.

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 high-consideration purchase, checking you find a genuine trust or information gap rather than another listing aggregator.

Clarify scope, whether this is within Facebook Marketplace or a standalone product, and confirm the target user, first-time buyers versus experienced ones.
List pain points: difficulty trusting private-party sellers, uncertainty about a vehicle's condition or history, and complexity comparing financing options.
Identify Facebook's advantage, its social graph, which could surface trust signals like mutual connections or local community reviews that anonymous listing sites lack.
Propose the design: a car buying feature within Marketplace that surfaces seller trust signals, vehicle history integration, and community-based Q&A from local buyers who've dealt with the seller.
Prioritize trust-building features first, since the biggest fear in private-party car buying is being scammed or misled, more than price comparison.
Define success as completed transactions and buyer-reported trust or satisfaction, confirming scope on whether financing or dealer integration is included.

Leverages Facebook's actual advantage, social trust signals like mutual friends or local group reputation, rather than building a generic vehicle history lookup.
Names the sharpest pain point precisely, fear of being scammed by an anonymous private seller, and designs directly against it.
Proposes a concrete mechanism, surfacing seller transaction history or community vouching within Marketplace, which competitors without a social graph cannot easily replicate.
Sets a measurable success metric, completed transaction rate and post-purchase trust rating, tied to the trust problem specifically.

Building a generic vehicle listing site that duplicates Craigslist or Facebook Marketplace's existing functionality with no differentiation.
Not identifying trust as the sharpest pain point in private-party car buying.
Ignoring Facebook's social graph as the actual differentiator available here.

How would you verify seller trustworthiness without relying purely on self-reported ratings?
How would you handle disputes between buyers and sellers after a transaction?