streaming_payroll_solana_flutter

Demo Video

Click here to see demo.

The Problem

Traditional payroll systems face several challenges:

• Delayed Payments: Employees often wait weeks or months for salary payments
• Geographical Barriers: Cross-border payments are slow and expensive
• Lack of Transparency: Employees can't track real-time earnings
• Administrative Overhead: Manual payroll processing is time-consuming
• Limited Access: Banking infrastructure limitations in some regions

The Solution

A decentralized streaming payroll system built on Solana that enables:

• Real-time Salary Streaming: Continuous token flow from employer to employee
• Instant Access: Employees can claim earned tokens anytime
• Transparent Tracking: Real-time visibility into earnings and available funds
• Cross-border Payments: Global payroll without traditional banking
• Automated Processing: Smart contracts handle calculations and distributions

How It Works

For Employers:

1. Create Stream: Set up payment stream with employee address, token selection, and rate per second
2. Deposit Funds: Fund the vault with tokens for payroll
3. Automated Distribution: Smart contract handles continuous payment calculations

For Employees:

1. View Earnings: Real-time tracking of earned but unclaimed tokens
2. Claim Anytime: Instant access to accumulated earnings
3. Transparent History: Complete visibility into payment streams

Tech Stack

Blockchain Layer:

Mobile Application:

• Flutter: Cross-platform mobile development framework

• Dart: Programming language for Flutter apps

• solana Dart Package: Solana blockchain integration

• Solana: High-performance blockchain for fast, low-cost transactions

• Anchor Framework: Rust-based framework for Solana program development

• SPL Tokens: Standard token implementation for payroll payments

Key Infrastructure:

• Program Derived Addresses (PDAs): Secure account management
• Cross-Program Invocations (CPI): Token transfer operations
• System Program: Account creation and management

Flutter Implementation

Architecture & Methodologies:

State Management:

• Provider Pattern: Centralized state management for wallet and blockchain operations
• ChangeNotifier: Reactive state updates for wallet connection status
• Consumer Widgets: Efficient UI updates based on state changes

Service Layer:

• SolanaClientService: Core blockchain interaction service
• Singleton Pattern: Single instance managing wallet and RPC connections
• Async/Await: Non-blocking blockchain operations

Data Models:

• TokenInfo: Structured token data with mint addresses and decimals
• JSON Serialization: Efficient data persistence and retrieval

Key Flutter Features Implemented:

UI Components:

• Custom Cards: Reusable BalanceCard widget with token display
• Responsive Layout: Adaptive design for various screen sizes
• Material Design: Consistent UI following Material guidelines

Navigation:

• MaterialPageRoute: Screen-to-screen navigation
• Tab-based Interface: Separate employer/employee dashboards

User Experience:

• Loading States: Progress indicators during blockchain operations
• Error Handling: User-friendly error messages and recovery
• SnackBar Notifications: Transaction feedback and status updates

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Solana Program

CLick here to go to solana program code.