A modular, scalable, and production-ready Loan Management System built using .NET 8 and architected with modern enterprise design principles: Clean Architecture (Onion), CQRS, Domain-Driven Design (DDD), and secure token-based authentication.
This system manages the complete lifecycle of loans — from application to approval, disbursement, and repayment — with fine-grained user roles and authentication. Designed as a backend-first MVP, the solution is structured for future extensibility (microservices, frontend clients) and real-world deployment.
LoanManagementSystem/
├── src/
│ ├── Business/
│ │ ├── Application/ # CQRS, Use Cases, Interfaces
│ │ ├── Domain/ # DDD Entities, VOs, Enums
│ │ ├── Infrastructure/ # EF Core, Services, Repositories
│ │ ├── Identity/ # Auth (JWT, Roles, OAuth2)
│ │ └── Shared/ # Common utilities and base types
│ └── Presentation/
│ └── API/ # ASP.NET Core Web API Entry Point
├── tests/
│ ├── UnitTests/
│ └── IntegrationTests/
├── docker-compose.yml
├── .editorconfig
└── .gitignore
| Layer | Technology / Pattern |
|---|---|
| Framework | .NET 8 |
| Architecture | Clean Architecture (Onion), DDD |
| Patterns | CQRS, MediatR, Repository, Unit of Work |
| ORM | Entity Framework Core (Code-First) |
| Database | PostgreSQL or SQL Server |
| Authentication | OAuth2 + JWT (Access & Refresh Tokens) |
| Authorization | RBAC (Role-Based Access Control) |
| Validation | FluentValidation |
| API Gateway | YARP (Reverse Proxy) |
| Logging | Serilog + Seq |
| Rate Limiting | ASP.NET Core Middleware / Redis (optional) |
| Caching | Redis (e.g., for token blacklisting) |
- OAuth2 Authorization Code Flow (or Password Flow for internal use)
- JWT with refresh token support
- RBAC permissions seeded via DB migrations
- Optional Redis-backed token blacklist
-
Clone the repository:
git clone https://github.com/your-org/LoanManagementSystem.git cd LoanManagementSystem -
Set up environment variables:
- Create .env or use dotnet user-secrets for local dev
- Run migrations:
dotnet ef database update --project src/Business/Infrastructure
- Launch the app:
dotnet run --project src/Presentation/AP
dotnet test tests/UnitTests
dotnet test tests/IntegrationTests- Admin Portal UI
- Loan Scheduling Engine
- Notification Service (SMS/Email)
- Multi-tenant support
- Audit logs and user activity tracking
This project is open-sourced under the MIT License.