C# (.NET) and Microservices: A Practical Guide

The book "C# (.NET) and Microservices" is a comprehensive practical guide to designing, developing, and deploying distributed systems using the .NET ecosystem. The author, an experienced architect and developer Alexey Smirnov, shares proven approaches and patterns that will help you transition from a monolithic application to a flexible, scalable microservices architecture.

What is this book about?

The book covers the full lifecycle of a microservices project: from choosing an architectural style to production deployment and monitoring. You will learn how to:

• Develop independent, loosely coupled services in C# using ASP.NET Core.
• Configure inter-service communication via REST, gRPC, and asynchronous queues (RabbitMQ, Azure Service Bus).
• Containerize applications with Docker and orchestrate them in Kubernetes.
• Implement resilience patterns: Circuit Breaker, Retry, Saga, CQRS, and Event Sourcing.
• Ensure security with JWT, OAuth2, and IdentityServer.
• Perform integration testing, logging, and centralized monitoring (Prometheus, Grafana, ELK).

Who is this book for?

The book is intended for:

• .NET developers at Junior/Middle level who want to master microservices architecture.
• Architects looking for practical examples of implementing distributed systems.
• DevOps engineers working with .NET projects who want to understand CI/CD specifics for microservices.
• Tech leads planning a migration from a monolith to microservices.

What will you learn?

• How to properly split a domain into services (DDD, Bounded Context).
• How to set up an API Gateway (Ocelot, YARP) and Service Discovery.
• How to organize distributed caching (Redis) and configuration management.
• How to automate build and deployment using GitHub Actions and Azure DevOps.
• How to avoid common pitfalls: distributed transactions, data consistency, network latency.

All examples come with source code (available on GitHub) and are ready for use in real projects. The book is written in a lively style, with a focus on practice — minimum theory, maximum working solutions.

Who is this book not for? If you have never written in C# or are not familiar with the basics of ASP.NET Core — start with an introductory course. Confident reading requires a basic understanding of OOP, HTTP, and SQL.

After reading, you will be able to independently design, write, and deploy a fault-tolerant microservice on .NET, ready for high loads.