🚀 Unlocking the Next Level of Microservices: Real-World Event-Driven Architecture with .NET 9

4 min readAug 6, 2025

Monoliths are the past. Microservices are the future. But how do you get there the right way?

Free Link:- In case if your medium quota is exhausted, you can read more about that here.

I’m thrilled to announce my next deep-dive course, currently in the works — one that brings real-world microservices architecture to life using .NET 9, RabbitMQ, MassTransit, Saga Pattern, Outbox Pattern, Idempotency, and Resilience strategies and many more. Whether you’re a seasoned .NET developer or aspiring architect, this course is going to level up your system design and engineering skills. Below, I have pasted the high level diagram for this.

🧱 What this Microservices Course Covers?

While there are plenty of tutorials that explain what microservices are, very few go end-to-end — covering:

Data consistency across services
Reliable messaging and retries
Resilient inter-service communication
CQRS & Domain-Driven Design principles
Idempotent consumers
Saga Pattern
Outbox pattern in production
Tracing events and failures across services

This course is not just theory — it’s a hands-on, production-grade build from scratch using the following:

🛠️ Tech Stack

📦 Solution Explorer overview

✅ Key Concepts Covered

Eventual Consistency with the Outbox Pattern
Reliable Messaging with Retry and Error Logging
Service Decoupling with Event Bus (RabbitMQ + MassTransit)
Handling Failures: PaymentFailedEvent & Compensation
Using CorrelationId for Distributed Tracing
Designing Idempotent Consumers
Dynamic Background Dispatchers with Scoped Services

📦 Microservices You’ll Build

Catalog Service — Retrieves products
Basket Service — User shopping cart
Ordering Service — Order placement + outbox table
Payment Service — Consumes events and updates order status
Outbox Dispatcher — Background publisher for reliable delivery

📌 Real-World Challenges Solved

What happens if RabbitMQ is down when order is placed?
→ We use Outbox + Retry logic.
What if the payment service publishes the same event twice?
→ The consumer is idempotent and ignores duplicates.
How do we track a flow from UI → Catalog → Basket → Payment → Order status?
→ We implement CorrelationId and Event Auditing.

🧩 Course Structure: Two Powerful Phases

📦 Phase 1: Complete Development Setup (Local + Containerized)

✅ Design & implement microservices for Catalog, Basket, Discount, Ordering, and Payment
✅ Implement RabbitMQ for event-based communication using MassTransit
✅ Build a modular Angular 20 frontend with routing, interceptors, auth
✅ Develop with CQRS, Outbox, Sagas, and record-based DTOs
✅ End-to-end flow: Basket ➝ Checkout ➝ Order ➝ Payment ➝ Status Update
✅ Run all services locally using Docker Compose with RabbitMQ & DB containers
✅ API Gateway & secured communication using JWT

☁️ Phase 2: Embracing Azure & Cloud-Native DevOps

🚀 Container registry via Azure Container Registry (ACR)
🚀 Production deployment on Azure Kubernetes Service (AKS)
🚀 GitHub Actions pipelines with multi-service CI/CD workflows
🚀 Service Discovery & observability using Istio Service Mesh
🚀 Distributed Tracing, Monitoring with Prometheus + Grafana
🚀 Secrets management, scalability strategies & blue-green deployments
🚀 Bonus: Infrastructure as Code with Terraform/Bicep (optional module)

In the meantime, my other courses are on sell.

Mastering React 18: Build a Swiggy-Style Food App 6+ hours course
Building FullStack E-Commerce App using SpringBoot & React 17+ hours course
Building FullStack E-Commerce App using SpringBoot & Angular 16+ hours course
Creating .Net Core Microservices using Clean Architecture 51+ hours course
Docker & Kubernetes for .Net and Angular Developers 7+ hours course

📲 Stay Connected & Keep Learning!

If you enjoyed this post and want to keep growing as a tech architect, let’s connect!

👉 Join my LinkedIn network for regular insights, architecture tips, and deep dives into real-world software systems:
🔗 linkedin.com/in/rahulsahay19

📺 Subscribe to my YouTube channel for tutorials, code walkthroughs, and clean architecture explainers:
🔗 youtube.com/@rahulsahay19

🐦 Follow me on Twitter for bite-sized tech tips, threads, and quick updates:
👉 twitter.com/rahulsahay19

Let’s grow, learn, and build better software — together! 🚀