Product design question

Design a product for borrowing and lending money on Facebook.

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

Whether the candidate can identify a defensible fintech niche within a social platform, addressing trust as the primary design constraint.

Define the user: friends and family lending small amounts informally, a use case already happening off-platform via cash or bank transfer apps.
Name the pain point: informal loans between friends lack a clear record, creating awkwardness or disputes over repayment.
Prioritize trust and clarity over speed: a simple agreement flow (amount, repayment date, optional reminder) tied to a real Facebook identity, not anonymous lending.
Propose a focused feature: a lending agreement tool integrated with Messenger, with automated repayment reminders and a clear shared record for both parties.
Define success as completed loans with on-time repayment rate, and reduced disputes reported by users, and name the key risk, regulatory complexity around lending.

Scopes to informal peer lending (friends and family), a real existing behavior, rather than proposing Facebook become a bank.
Names regulatory risk explicitly, since lending products face heavy compliance requirements that a generic feature answer would miss.
Proposes a record-keeping and reminder tool as the actual value-add, since trust and clarity, not interest rates, are the core problem here.

Proposing Facebook become a full lending platform without addressing the heavy regulatory burden that involves.
Ignoring that the core value is reducing awkwardness and disputes, not enabling large-scale lending.

How would you handle a loan that isn't repaid on time without damaging the friendship or trust in the platform?
What regulatory constraints would limit where you could launch this?