K's & A's, a multiplayer card game
A real-time card game for four to seven players, with its own rules engine, shipped to iOS and Android.
- Year
- 2025
- Context
- In-house product
- Tools
- Flutter, Dart, Firebase Realtime Database
What it is
K’s & A’s is a fast, social card game for four to seven players. Everyone plays on their own phone, in real time, from anywhere.
How it’s built
- One codebase, two platforms. Built in Flutter and Dart, it ships to the iOS App Store (through TestFlight) and as an Android app.
- Real-time multiplayer. Game state syncs through Firebase Realtime Database, so every move appears on every phone at once.
- A custom game engine. Written in Dart, it validates every play, manages turns, works out rankings at the end of each round and handles the card exchanges between rounds.
- Fair play. The engine checks every move, so a modified app can’t play a card it doesn’t hold.
Why it matters
Real-time sync, rule engines and cheat-resistant state are the same problems behind booking systems, auctions and collaborative tools. Solving them in a game, where players notice every glitch, keeps us sharp.