Nutshell Series

Software Architectures Explained (Quick & Practical Guide)

Manjunath

If you’re building applications in .NET or any backend stack, understanding architecture is critical. Here’s a concise guide to the most important software architectures.

1. Layered Architecture (N-Tier)

Structure:

Controller → Service → Repository → Database
  • Pros: Simple, easy to implement
  • Cons: Tight coupling, harder to scale
  • Best for: Small to medium applications

2. Clean Architecture

Idea: Dependencies always point inward. Business logic is independent.

UI → Application → Domain → Infrastructure
  • Pros: Highly testable, maintainable
  • Cons: More boilerplate
  • Best for: Enterprise systems

3. Onion Architecture

Idea: Domain is at the center, everything depends on it.

    Domain (Core)
 Application Layer
Infrastructure Layer
  • Pros: Strong domain focus
  • Cons: Learning curve
  • Best for: Domain-driven applications

4. Hexagonal Architecture (Ports & Adapters)

Idea: Isolate core logic using interfaces (ports) and implementations (adapters).

Adapters → Ports → Core Domain → Ports → Adapters
  • Pros: Decoupled, testable
  • Cons: More abstraction
  • Best for: Maintainable systems, microservices

5. Monolithic Architecture

Idea: Entire application in a single codebase.

  • Pros: Simple deployment
  • Cons: Hard to scale
  • Best for: Startups, MVPs

6. Microservices Architecture

Idea: Break system into independent services.

User Service | Order Service | Payment Service
  • Pros: Scalable, independent deployments
  • Cons: Complex (network, monitoring)
  • Best for: Large distributed systems

7. Event-Driven Architecture

Idea: Components communicate via events.

OrderPlaced → PaymentProcessed → EmailSent
  • Pros: Loose coupling, scalable
  • Cons: Hard debugging
  • Best for: Real-time systems

8. CQRS (Command Query Responsibility Segregation)

Idea: Separate read and write operations.

  • Pros: Performance optimization
  • Cons: Added complexity
  • Best for: High-scale systems

9. Domain-Driven Design (DDD)

Idea: Design software based on business domain.

  • Key concepts: Entities, Value Objects, Aggregates
  • Best for: Complex business logic systems

10. Serverless Architecture

Idea: Run code without managing servers.

  • Pros: Auto-scaling, cost-efficient
  • Cons: Cold starts, debugging challenges
  • Best for: Cloud-native apps

11. Modular Monolith

Idea: Single app, but divided into well-structured modules.

  • Pros: Balance of simplicity and structure
  • Cons: Requires discipline
  • Best for: Growing applications

Quick Summary

  • Small apps: Layered / Monolith
  • Growing apps: Modular Monolith
  • Enterprise: Clean / Hexagonal
  • Large scale: Microservices + Event-driven

Start simple. Add complexity only when needed. The right architecture depends on your scale, team, and business needs.

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