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Developer Builds AI WhatsApp Message Router to Prioritise Notifications at Hackathon

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A developer created an AI-powered message routing system for WhatsApp-style conversations during HackerRank's Orchestrate 24-hour hackathon. The system classifies every incoming message into one of three categories — notify, digest, or mute — based on both message content and user behaviour. It analyses text, images, and voice notes while factoring in signals like sender trust, past user reactions, and whether the message arrives during quiet hours. The solution also incorporates protection against prompt-injection attacks, ensuring instructions embedded within images or transcripts cannot override the system's core logic. The developer's central design principle was that personalised context should drive notification decisions rather than message content alone.

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