Understanding Microservices with .NET

Microservices let teams ship faster and scale independently, but they add complexity in design, data, and operations. This book shows how to build cloud-ready services with modern .NET and ASP.NET Core using containers and Kubernetes grounded in real patterns and trade-offs for developers, architects, and DevOps engineers.

The book begins by establishing the core principles of microservices, detailing when and how to apply powerful design patterns like domain-driven design (DDD), Saga, CQRS, and Circuit Breaker for resilience. You will move on to hands-on development, building a full e-commerce application with services for Catalog, Basket, and Ordering, and implementing asynchronous communication using MassTransit and RabbitMQ for reliable transactions. The book then transitions to essential operational maturity, covering centralized security with IdentityServer4, testing, containerization with Docker, building strong CI/CD pipelines, and advanced deployment to Kubernetes using Helm and Terraform (GitOps). The final section ensures your services run flawlessly by teaching you scaling (HPA/VPA), deep observability with Prometheus, and future trends like agentic AI microservices.

By the end, you will model bounded contexts, choose the right sync/async protocols, apply resiliency patterns, secure and version APIs, automate delivery, run on Kubernetes, and instrument your system—confidently shipping scalable, reliable .NET microservices.

WHAT YOU WILL LEARN
● Build fast .NET Web APIs and gRPC endpoints.
● Add resiliency with retries, circuit breakers, and timeouts.
● Secure microservices using OAuth2, OIDC, and JWT tokens.
● Automate CI/CD, GitOps, and blue-green Kubernetes releases safely.
● Design robust microservices using DDD, Saga, CQRS, and MassTransit/RabbitMQ patterns.
● Achieve deep observability using OpenTelemetry, Prometheus/Grafana, and ELK stack.

WHO THIS BOOK IS FOR
This book is for .NET developers, backend engineers, solution architects, DevOps/SREs, and technical leads who are new to microservices or modernizing monoliths. It suits beginner-to-mid-level practitioners and senior engineers seeking a pragmatic, end-to-end playbook for designing, building, securing, deploying, and operating cloud-native services on .NET.

1. Introduction to Microservices Architecture
2. When to Use Microservices
3. Designing Microservices for Distributed Systems
4. Designing Robust Microservices
5. Leveraging .NET for Microservices Development
6. Microservices Architecture for a Typical E-commerce
7. Developing the Catalog Microservice
8. Creating the Basket API Microservice
9. Building the Ordering Microservice
10. Developing Shipping and Handling Microservices
11. Implementing Security Across Microservices
12. Containerizing Microservices with Docker
13. Strategies for Testing and Test-driven Development
14. Deployment Patterns for Microservices
15. Continuous Integration and Continuous Deployment
16. Infrastructure as Code and GitOps
17. Deploying with Kubernetes
18. Scaling Microservices with Kubernetes
19. Monitoring and Logging Microservices
20. Real-world Examples and Case Studies
21. Challenges and Best Practices
22. Conclusion and Future Trends

Sepehr Pakbaz is a cloud and AI solutions architect and technical leader currently living in the San Francisco Bay Area, with over 20 years of experience building large-scale, cloud-native distributed systems on Azure and AWS for companies such as Microsoft, Amazon, IBM, United Airlines, and Walmart, as well as their customers across multiple industries from small and mid-size to large enterprises. He has led modernization projects, guided engineering teams, and helped Fortune 500 customers adopt microservices, Kubernetes, DevOps, and AI-powered applications. Sepehr holds a master’s degree in management information systems and multiple Microsoft, AWS, and Kubernetes certifications. He shares his work through his blog, online meetups, community calls, and conference talks on cloud architecture and modern application development.