I need an individual fullstack developer (Flutter frontend + Node.js/PHP backend) to debug and stabilize my app. AI assistance is allowed, but all fixes must be verified manually, fully tested, and auditable. Scope / Core Issues: WebSocket / chat: reconnection logic, sync, error handling Wallet persistence: app forgets wallet on restart Balance update delay: refresh required Transaction history: wrong API endpoints, missing logs QR scanner: missing for sending funds Crypto backend APIs inactive: register, create, restore, tokens, notifications Requirements: Maximum 62 hours, preferred less Tasks will be audited Clear documentation and testing required Individual developer only – no teams Payment: Fixed-price milestone Payment released after verification of fixes Notes: Open to competitive bids: lowest qualified bid can win Serious applicants only.