Developer Builds Real-Time Multiplayer Prediction Game Using Next.js, Node, and BigInt Math

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A developer spent four months transforming a static take-home assignment into a live, browser-based multiplayer prediction game called RPS League. The game resolves global matches every five seconds and syncs results to all connected players using Server-Sent Events, with proxy buffering bypassed to ensure sub-second delivery. To handle massive compounding numbers without precision loss, the entire stack was refactored to use PostgreSQL NUMERIC fields, native Node BigInt operations, and a custom suffix-scaling engine. A bulk database transaction pattern was implemented for leaderboard queries to avoid N+1 performance issues, and an idle auto-predict mode was built with tab-visibility guards to prevent API flooding. An AI-powered Oracle guide was also integrated using the Gemini API, secured with rate limiting, input validation, and strict system prompts.

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