Your question is Anonymous Group Messaging. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design an anonymous group messaging app where identities are hidden and unique per group.
Asked in the Round 5 stage. Mostly client side focused with some back-end design.
Discuss how the mobile client creates and persists a distinct pseudonym for each group, sends and receives messages securely, and handles offline use. Explain the minimum backend needed for group membership, message delivery, synchronization, and abuse prevention. If adding ML, describe where inference belongs without exposing a user's real identity.