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System Architecture

Overview

The Real Estate DeFi Platform is built as a monorepo with multiple specialized applications working together to provide a complete solution for real estate tokenization and DeFi lending on the Stellar blockchain.

High-Level Architecture

┌─────────────────┐    ┌─────────────────┐    ┌─────────────────┐
│   Web Frontend  │    │   Backend API   │    │  Smart Contracts│
│   (Next.js)     │◄──►│   (Elysia/Bun)  │◄──►│   (Soroban)     │
│   Port: 3000    │    │   Port: 3001    │    │  Stellar Network│
└─────────────────┘    └─────────────────┘    └─────────────────┘
         │                       │                       │
         │              ┌─────────────────┐              │
         └──────────────►│  Shared Library │◄─────────────┘
                        │ (Types/Utils)   │
                        └─────────────────┘

Component Breakdown

1. Web Application (apps/webapp)

Technology Stack:

  • Next.js 14 with App Router
  • TypeScript for type safety
  • Tailwind CSS for styling
  • Stellar SDK for blockchain integration
  • React Query for state management

Responsibilities:

  • User interface for property browsing
  • Wallet connection and management
  • Share purchase/sale interface
  • Lending pool interactions
  • KYC document upload
  • Portfolio management

2. Backend API (apps/api)

Technology Stack:

  • Elysia framework (Bun runtime)
  • TypeScript
  • Stellar SDK for blockchain operations
  • Swagger for API documentation
  • Built-in validation and error handling

Responsibilities:

  • RESTful API for frontend consumption
  • Blockchain transaction orchestration
  • KYC verification workflow
  • Data aggregation and caching
  • Transaction monitoring
  • User management

3. Smart Contracts (apps/contracts)

Technology Stack:

  • Rust programming language
  • Soroban SDK
  • Stellar blockchain
  • WASM compilation target

Responsibilities:

  • Property tokenization logic
  • Share ownership tracking
  • Lending pool management
  • Collateral management
  • Interest calculation
  • Liquidation logic

4. Shared Library (apps/shared)

Technology Stack:

  • TypeScript
  • Common type definitions
  • Stellar utilities
  • Validation functions
  • Constants and configurations

Responsibilities:

  • Type sharing between frontend and backend
  • Common utilities and helpers
  • Validation logic
  • Stellar integration utilities
  • Constants and enums

Data Flow Architecture

Property Tokenization Flow

1. User uploads property info → Frontend
2. Frontend validates → Backend API
3. API verifies KYC → External KYC Service
4. API tokenizes property → Smart Contract
5. Contract emits event → API monitors
6. API updates database → Frontend refreshes

DeFi Lending Flow

1. User wants to borrow → Frontend
2. Frontend calculates available → Backend API
3. API checks collateral → Smart Contract
4. Contract validates → API processes
5. API executes transaction → Smart Contract
6. Contract transfers funds → Frontend updates

Security Architecture

1. Authentication & Authorization

  • Wallet-based authentication using Stellar signatures
  • Role-based access control for different user types
  • KYC verification for compliance
  • Rate limiting to prevent abuse

2. Smart Contract Security

  • Access control patterns for admin functions
  • Reentrancy protection for lending operations
  • Input validation for all external calls
  • Event logging for audit trails

3. API Security

  • CORS configuration for frontend access
  • Input sanitization to prevent injection attacks
  • Environment variable protection for sensitive data
  • API key management for external services

Scalability Considerations

1. Frontend Scaling

  • Static generation for property listings
  • Incremental Static Regeneration for dynamic content
  • Client-side caching with React Query
  • Code splitting for optimal loading

2. Backend Scaling

  • Horizontal scaling with stateless API design
  • Database connection pooling for efficiency
  • Redis caching for frequently accessed data
  • Queue processing for background tasks

3. Blockchain Scaling

  • Stellar's high throughput (5,000+ TPS)
  • Low transaction fees for user accessibility
  • Batch operations for efficiency
  • Optimized contract storage to reduce costs

Monitoring & Observability

1. Application Monitoring

  • Health check endpoints for service status
  • Performance metrics for response times
  • Error tracking with structured logs
  • User analytics for platform usage

2. Blockchain Monitoring

  • Transaction monitoring for failed transactions
  • Event listening for real-time updates
  • Contract state monitoring for security
  • Network status for Stellar operations

3. Infrastructure Monitoring

  • Server resource utilization
  • Database performance metrics
  • API rate limiting status
  • SSL certificate monitoring

Deployment Architecture

Development Environment

Local Machine:
├── Frontend (localhost:3000)
├── Backend API (localhost:3001)
├── Stellar Testnet
└── Mock KYC Service

Production Environment

Cloud Infrastructure:
├── Frontend (CDN/Static Hosting)
├── Backend API (Load Balanced)
├── Database (Managed PostgreSQL)
├── Redis Cluster
├── Stellar Mainnet
└── Production KYC Service

Integration Points

External Services

  1. Stellar Network - Blockchain operations
  2. KYC Providers - Identity verification
  3. Property Data APIs - Real estate information
  4. Price Oracles - Asset valuation
  5. Payment Processors - Fiat on-ramps

Internal Integrations

  1. Shared Types - Frontend ↔ Backend communication
  2. Stellar SDK - All components ↔ Blockchain
  3. Database Models - API ↔ Data persistence
  4. Event System - Smart Contracts ↔ API monitoring

Future Architecture Considerations

1. Multi-chain Support

  • Bridge contracts for other blockchains
  • Cross-chain asset transfers
  • Unified asset representation

2. Advanced Privacy Features

  • Zero-knowledge proof integration
  • Private lending pools
  • Encrypted transaction data

3. Institutional Features

  • Enterprise-grade compliance tools
  • Advanced reporting capabilities
  • Custom contract deployment

This architecture provides a solid foundation for the Real Estate DeFi Platform while maintaining flexibility for future growth and feature additions.