Cross-Platform Chess Game App

I need an end-to-end partner for a chess gaming app that will launch on both Android (Google Play) and iOS (App Store). The scope covers everything from coding the core gameplay and clean UI all the way through store-ready builds, icon/screenshot assets, and live deployment under my developer accounts.

Key points
• Game type: classic Chess, against human opponents (online and local).
• Platforms: Android and iOS in a single, shared codebase—Unity, Flutter, or another cross-platform engine you’re comfortable with is fine as long as performance is smooth on typical mid-range devices.
• Services: integrate basic user profiles, matchmaking/lobby, simple leaderboard, and optional in-app purchases to unlock board themes.
• Compliance: meet Google Play and App Store guidelines (privacy policy, age rating, screenshots, app privacy labels, etc.).
• Deliverables: production-ready APK & IPA, store listings prepared, source code handed off in a Git repo, and up to one post-launch hotfix included.

If you’ve shipped multiplayer or board-game titles before, please share links or store pages so I can see them in action.