JavaScript/TypeScript Developer for Game Backend Fixes

I need an experienced JavaScript/TypeScript developer to take over an existing browser board game built with Next.js, Phaser 3, and Supabase on Vercel, with deposits running on Solana devnet. The first block of work is a specific list of fixes — a token deposit endpoint that fails for some wallets, a provably-fair dice roll system that was implemented incorrectly, and payout maths that needs rebalancing — followed by ongoing feature work on the game itself. The game is live on a test network, so this is repair and hardening on a real codebase, not a build from scratch.