Microservice 2026

Top 10 Important Microservices Interview Questions & Answers

1) What is Microservices Architecture?

Microservices architecture is a design pattern where an application is built as a collection of small, independent services. Each service runs separately and communicates using APIs (REST or messaging).

2) What is the difference between Monolithic and Microservices architecture?

• Monolithic: Single large application, tightly coupled modules.
• Microservices: Small independent services, loosely coupled.

3) What are the advantages of Microservices?

• Independent deployment
• Easy scaling
• Technology flexibility
• Better fault isolation
• Faster development

4) What are the challenges in Microservices?

• Complex deployment
• Network latency
• Data management complexity
• Monitoring difficulty
• Distributed system failures

5) What is API Gateway?

API Gateway acts as a single entry point for all client requests. It routes requests to appropriate microservices and handles security, logging, and load balancing.

Examples: Kong, Zuul

6) What is Service Discovery?

Service Discovery helps microservices find each other dynamically without hardcoding IP addresses.

Examples: Eureka, Consul

7) What is Circuit Breaker?

Circuit Breaker prevents a system from repeatedly trying to call a failing service. It temporarily stops calls to avoid system crash.

Example: Hystrix

8) What is Containerization?

Containerization packages an application with all its dependencies into a container so it runs the same everywhere.

Example: Docker

9) What is Orchestration?

Orchestration manages deployment, scaling, and networking of containers automatically.

Example: Kubernetes

10) What is Database per Service pattern?

Each microservice has its own database. Services should not directly access another service’s database. Communication must happen through APIs only.

Prepared for Microservices Interview Preparation