Bonyan

Bonyan is an open-source .NET library I designed and built to simplify the development of applications following the Modular Monolith architectural pattern.

The Problem

Many teams want the clean module boundaries of microservices without the operational complexity of running dozens of independent services. Modular Monolith is the answer — but there was no standardized, well-tested toolkit for .NET developers to adopt this pattern consistently.

What Bonyan Provides

• Module system — define bounded contexts as independent modules with their own dependency registrations
• DDD building blocks — Aggregate Roots, Entities, Value Objects, Domain Events, Repositories
• CQRS support — Command/Query handlers with MediatR integration
• Outbox pattern — reliable event publishing with RabbitMQ support
• EF Core integration — convention-based configuration for clean persistence

Architecture

YourApp/
├── Modules/
│   ├── Identity/
│   │   ├── Domain/
│   │   ├── Application/
│   │   └── Infrastructure/
│   └── Billing/
│       ├── Domain/
│       ├── Application/
│       └── Infrastructure/
└── Host/

Each module is self-contained, registers its own services, and communicates with other modules through well-defined interfaces or domain events — no tight coupling.

Impact

Published on NuGet, actively used by developers building real-world .NET applications. The library demonstrates how clean architecture principles can be made accessible without sacrificing flexibility.