Architecture and tech stack
High Level Diagram of System
Core Technology Stack
| Component | Technology | Purpose |
|---|---|---|
| Backend Microservice | NestJs | Main application server, REST API endpoints |
| Database | PostgreSQL + Prisma | Data persistence and type-safe queries |
| Smart Contracts | Solidity + Hardhat | Blockchain interaction and business logic |
| Indexing | The Graph | Blockchain data indexing and GraphQL API |
| Containerization | Docker | Application containerization and deployment |
| MultiSig | Safe/Gnosis | Wallet for the MultiSig operations |
| Offramping Service | KotaniPay | Offramping Service for crypto conversion to fiat |
Folder Structure
rahat-project-c2c/ ├── .github/ # CI workflows, issue/pr templates ├── abis/ # Auto-generated contract ABIs ├── apps/ │ ├── c2c/ # Frontend app for C2C dashboard (React + Nx) │ ├── c2c-e2e/ # Cypress-based end-to-end tests │ ├── contracts/ # Hardhat smart-contract project │ ├── graph/ # Subgraph mappings & schema │ └── graph-old/ # Legacy subgraph (archived) ├── docs/ # Architecture docs, design specs └── libs/ # Shared packages (contract types, extensions, react-query hooks...)