Microservices Tutorial

1. Microservices Introduction

How to actually split a monolith, what a real microservice codebase and deployment pipeline look like.

2. Service Communication

Synchronous REST/gRPC vs asynchronous events, with the same Orders-to-Inventory example built both ways.

3. Advanced Design Principles

Bulkheads, circuit breakers, jittered retries with backoff, and idempotency keys for safe retries — with Spring Boot, ASP.NET Core, and Go examples.

4. API Gateway Patterns

Routing, request aggregation, and the Backend for Frontend (BFF) pattern for serving different clients.

5. Rate Limiting

Token bucket vs sliding window vs fixed window, and a complete per-client rate limiter in Spring Boot, ASP.NET Core, and Go.

6. Mutual TLS & Service-to-Service Security

Why mTLS beats API keys/JWTs for zero-trust service auth, with a complete setup in Spring Boot, ASP.NET Core, and Go.

7. Service Discovery & Configuration

DNS-based and registry-based discovery, centralized configuration, and liveness vs readiness health checks.

8. Saga Pattern & Distributed Transactions

Choreography vs orchestration sagas, with a complete worked order-placement example and compensating actions.

9. Observability for Microservices

Correlation IDs, distributed tracing with spans and traces, and the three pillars: logs, metrics, and traces.

10. Secrets Management

Why secrets leak in source control, env vars, and config files, and how to fetch them from Vault, Key Vault, and Kubernetes Secrets instead.

11. Testing Microservices

Consumer-driven contract testing with Pact, the testing pyramid for distributed systems, and isolation vs integration environments.

12. Microservices Interview Questions

Practical microservices interview questions on discovery, tracing, communication trade-offs, and deployment independence.