Secure BSC Backend & Contracts

I already have the frontend UI ready for my BNB Chain (BSC) platform — now I need a backend + smart contract to handle user deposits, track balances, and manage withdrawals.

The platform works custodially, similar to Photon or Axiom.
Users can create a simple username account, but they can also optionally connect their wallet via WalletConnect for tracking or withdrawals.
All trading and deposits will still go through the backend, not direct wallet execution.

Requirements:
• Smart contract for BNB deposits & withdrawals
• Backend (Node.js preferred) to track balances and process transactions
• Real-time updates for new deposits and balance changes
• Optional WalletConnect integration (for linking external wallets)
• Secure admin dashboard to view users, balances, and approve withdrawals
• Full testing and deployment on BSC Testnet before mainnet

Deliverables:
1. Working deposit & withdrawal smart contract
2. Secure backend API for users and admin
3. Admin panel (React or any clean dashboard)
4. Testnet demo showing deposits, balances, and withdrawals
5. Complete source code and setup guide

Important:
• Only developers with BSC / EVM experience
• Must show one live BSC/EVM project or GitHub repo
• Real blockchain devs only — no copy-paste or AI bids