This project provides a gRPC fintech internal service for user authentication and wallet management. It leverages Protocol Buffers for defining services, PostgreSQL for data storage, and Docker for containerization, ensuring a robust and scalable backend infrastructure.

• Language: Go 1.25.5
• Framework: gRPC with Protocol Buffers
• Database: PostgreSQL 14
• ORM: GORM
• Authentication: JWT (golang-jwt)
• Hashing: Argon2 with base64 encoding
• Containerization: Docker & Docker Compose

Core Services:

User Service: Manages user authentication and account operations, including registration, login, profile management, and account deactivation. Key features include secure password hashing with Argon2 and JWT token generation/validation.

RPCs for User Service:

• CreateUser: Registers a new user.
• LoginUser: Authenticates a user and provides a JWT token.
• UserProfile: Fetches the authenticated user's profile.
• UpdateProfile: Updates user profile information.
• DeactivateAccount: Deactivates a user's account.

Wallet Management Service:

Handles wallet operations such as checking balances, depositing funds, withdrawing funds, and retrieving transaction history. It ensures real-time balance updates, transaction history tracking, and atomic balance updates with versioning.

RPCs for Wallet Service:

• Balance: Retrieves the current wallet balance.
• Deposit: Adds funds to the wallet.
• Withdrawl: Removes funds from the wallet.
• TransactionHistory: Fetches the history of transactions for the wallet.

Key Features:

• Secure password hashing using Argon2 with salt (base64 encoded).
• JWT token generation and validation for secure API access.
• User status management (active, inactive).
• Real-time wallet balance updates.
• Comprehensive transaction history tracking.
• Atomic wallet balance updates with versioning to prevent inconsistencies.
• Wallet status management (active, locked, suspended).

Development and Future Enhancements:

The project includes a Makefile for easy service management (up, logs, down, ps). Future enhancements include multi-currency support, rate limiting, enhanced security features like 2FA, and analytics dashboards.