# Technology Stack

## Frontend

| Technology | Version | Purpose |
|------------|---------|---------|
| Angular | 19.x | Application framework |
| Angular Material | 19.x | UI component library |
| RxJS | 7.x | Reactive state management |
| TypeScript | 5.x | Type-safe development |

## Backend

| Technology | Version | Purpose |
|------------|---------|---------|
| NestJS | 10.x | API framework |
| TypeScript | 5.x | Type-safe development |
| TypeORM | 0.3.x | Database ORM |
| Passport | 0.7.x | Authentication |

## Database

| Technology | Version | Purpose |
|------------|---------|---------|
| PostgreSQL | 16.x | Primary data store |
| Redis | 7.x | Session cache, rate limiting |

## Blockchain

| Technology | Version | Purpose |
|------------|---------|---------|
| Hyperledger Besu | 24.x | Ethereum-compatible blockchain |
| Solidity | 0.8.x | Smart contract language |
| Web3.js | 4.x | Blockchain interaction |

## Infrastructure

| Technology | Purpose |
|------------|---------|
| Docker | Container runtime |
| Nginx | Reverse proxy, static files |
| Let's Encrypt | TLS certificates |

## Monitoring

| Technology | Purpose |
|------------|---------|
| Prometheus | Metrics collection |
| Grafana | Visualization |
| Loki | Log aggregation |