I’m setting up a feature-rich Rummy app that must feel native on both iOS and Android while sharing a single codebase where possible. At its core the game will open in a polished single-player mode, yet allow players to invite friends or join public tables whenever they’re ready, so the architecture has to accommodate seamless “single player with multiplayer options” from day one. Here is what I need from you: • Game design – complete UI/UX flow, visual assets, and game-play polish that respects traditional Rummy rules while keeping the learning curve low for new users. • Robust backend logic – secure, scalable game servers (prefer Node.js, Java, or similar) that handle matchmaking, scoring, chips, and anti-cheat routines. • Secure payment integration – wallet management, in-app purchases, and withdrawals with industry-standard encryption and compliance (PCI-DSS, GDPR). Deliverables will include source code, build files for TestFlight and Google Play Internal Testing, technical documentation, and a brief hand-over session. I’ll review work against smooth performance on mid-range devices, flawless reconnection handling, and end-to-end payment sandbox tests. Please share relevant card-game projects, your proposed tech stack, estimated timeline, and commercial terms so we can move quickly into production.