Design a social networking domain model covering users and profiles, friendship requests and symmetric friendships, and posts with a visibility policy, comments, and reactions — enforcing symmetric friendship, unique requests, author ownership, and visibility-based read authorization.
Design a social networking platform: users become friends via a request-and-accept handshake, and publish posts that are visible to the public, only to friends, or only to themselves, and that others can comment on and react to according to that visibility. Start by clarifying scope and the core objects.
Work in the provided coding workspace while explaining your decisions to the live interviewer. Validation may use inline tests, examples, comments, or a verbal walkthrough.
Practice this problem in the live coding workspace while the interviewer probes your clarification, implementation, trade-offs, and validation.
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