Brazil Pix Payment Integration

I need a developer to integrate a payment gateway for Brazil's Pix system and manage user balances. The integration should be secure and user-friendly.

Key functionalities include:
- Payment gateway integration for Brazil Pix (specific gateway to be discussed)
- Manage user balance with:
- Transaction history
- Deposit and withdrawal

Ideal skills and experience:
- Experience with Brazil Pix and relevant payment gateways (PagSeguro, Mercado Pago, Banco Inter, etc.)
- Strong background in secure user authentication
- Proficiency in managing financial transactions and user balances