Student Builds Internet-Free Campus Chat App in 72 Hours Using No External Libraries

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A developer built CampusLink, a browser-based chat tool that runs over a local WiFi network without requiring internet access, during the Hackathon Raptors Zero-Dependency Hackathon. The competition prohibited all external packages and libraries, forcing the creator to write core functionality — including HTTP request parsing — entirely from scratch using only standard language tools. The app allows anyone on the same network to send messages, reply, react, and vote on polls without creating an account, using browser cookies to identify users. Building without shortcuts exposed real-world bugs, including orphaned reply data when parent messages were deleted and a race condition in the poll-voting system that only surfaced during live testing with actual users. The project, completed in 72 hours, marked the developer's first fully self-designed and shipped software product.

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