Create Mobile Chess Game for Android/iOS

I am looking to develop a mobile chess-based game for Android and iOS. The game will use standard chess piece movement logic (rook, bishop, knight, queen etc.) but with custom rulesets and multiple match types/modes. The key elements are account creation, online matches with responsive controls, matchmaking, player rankings, and AI opponents. Visuals are extremely important to me and will help decide on who I pick for the project. So if you have examples of good looking games then please share then with me The project will require: - Chess movement/pathing logic for all standard pieces - Support for customising games - Online multiplayer matchmaking and private matches - AI opponents integrated using Fairy-Stockfish or a similar chess engine - AI difficulty scaling and human-like behaviour (mistakes, varied playstyles, response timing) - Real-time turn timers and move forfeits - Player rating/ranking system with leagues/promotions/relegations - Mobile touch controls (tap-to-move and drag-and-drop support) - Backend/database support for accounts, matchmaking, progression, rankings, cosmetics, and stats - Rewarded ads - Cosmetic unlock systems The visual style should be clean and stylised rather than realistic, with strong UI/UX and smooth gameplay being a priority. The game should be designed in a scalable way so additional rulesets, cosmetics, and gameplay variations can easily be added later. Please drop me a message if you have worked on anything similar in the past, what engine you would use and your cost/timeline for this