Microservices Architecture Fundamentals

What Are Microservices?

Microservices architecture structures an application as a collection of loosely coupled, independently deployable services. Each service focuses on a specific business capability.

Key Characteristics

Autonomy

Each microservice owns its business logic and data. Teams can develop and deploy independently.

Scalability

Scale only the services that need it. A search service can scale differently than a payment service.

Resilience

Failure in one service doesn't bring down the entire system. Implement circuit breakers and fallbacks.

Flexibility

Choose the right technology for each service. Use Node.js for APIs, Python for data processing, etc.

Communication Patterns

Synchronous (Request-Response)

Using REST APIs or gRPC for direct service-to-service communication.

Asynchronous (Event-Driven)

Using message queues for loose coupling and better resilience.

Common Challenges

• Distributed Complexity: Debugging becomes harder across services
• Data Consistency: Managing transactions across services
• Operational Overhead: More services to monitor and deploy
• Network Latency: Remote calls introduce delays

When to Use Microservices

• Large teams working on different features
• Different services have different scaling needs
• Services need independent technology stacks
• High availability is critical

Remember: Start monolithic, migrate to microservices when needed.