Product / Manufacturing / 2025-2026
Guinote+
Building Guinote+ as a modern Spanish card-game app with online multiplayer, friends, private rooms, offline play, progression, Monte Carlo AI, and a physical deck direction.
Spanish card-game product with real-time multiplayer, offline modes, player progression, Monte Carlo AI, and physical deck planning.
- Role
- Founder and solo developer
- Status
- Shipping
- Tools
- React NativeTypeScriptPostgreSQLSupabaseMonte Carlo simulationRealtime audioPrint specs
Problem
My dad played Guinote almost every day with his uncle, but the app they used felt outdated, had too many ads, and made online play unreliable. I started Guinote+ to build the version I wanted them to have: a cleaner, modern app for playing the game online, offline, and eventually with a physical deck.
What I built
- Built the mobile app foundation with authentication, game state, database-backed flows, player profiles, stats, and core app screens.
- Built real-time online multiplayer, a friends system, private/local rooms, offline mode, tutorials, and a campaign mode around the traditional game.
- Added a shop system with card backs and skins, profile progression, and a real-time audio drop system to make the app feel more complete.
- Implemented Monte Carlo AI for gameplay decisions, improving bot win rate from 32% to 53%.
- Started extending the product into physical card manufacturing, including print specs, supplier coordination, packaging, and launch planning.
Engineering decisions
- Built online and offline play together so the app would still be useful when a real opponent was not available.
- Built gameplay simulation early so the AI opponents would make decisions that felt close to the real game.
- Kept the physical card direction connected to the app from the beginning.
Result
- The project spans the app, multiplayer systems, offline play, tutorials, campaign flow, shop/profile systems, gameplay simulation, product design, and early manufacturing planning.
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