Project Description: I am looking for a professional Python developer to optimize and secure an existing Telegram Reward Bot. The bot is built using pyTelegramBotAPI (Telebot), Flask, and Firebase Real-time Database. The core structure (511 lines of code) is already functional. I do NOT need a bot from scratch. I only need an expert to fix 5 specific logic gaps to ensure the bot acts with "AI-level precision" and prevents any user fraud. Key Deliverables (The Fixes): Strict Input Validation (Regex): Secure the Wallet Binding system. The bot must reject any text that doesn't strictly match the required format (Name, Acc Type, 11-digit Number for PKR / 34-char 'T' prefix for TRX). Withdrawal Logic Hardening: Fix the "Withdraw Funds" button. It must perform real-time balance checks against Firebase and only accept integer inputs that meet minimum thresholds (PKR 2,000 / TRX 12,000). Referral Milestone Condition: Modify the referral reward system. The 150-coin reward should ONLY be credited to the inviter AFTER the new referral completes at least 3 tasks (tracked via tasks_count in Firebase). Admin Control Extension: Add /deductcoins [user_id] [amount] and /banuser [user_id] commands to the existing admin panel. Auto-Reminder Scheduler: Optimize the current reminder thread to ensure it sends a 24-hour inactivity reminder accurately based on the user's last task time. Navigation Flow: Fix the "Back Button" logic to ensure the menu never disappears if a user types an invalid command. Technical Requirements: Expert in Python & Firebase RTDB. Strong understanding of Input Sanitization and State Handling. Ability to work within the existing 511-line codebase without deleting or breaking current functions. Budget: Fixed $20 - $40. Timeline: 1-2 Days. Note: I have the source code ready. Place your bid only if you can work within this budget. Generic $100 to $150+ bids will be ignored.