🔗 Microservices Interview Questions

Master distributed systems with questions on architecture patterns, resilience, and service communication

Distributed systems, patterns, circuit breakers, and service communication

🔗 Microservices Architecture

Master microservices patterns, circuit breakers, service discovery, and distributed systems concepts

What are Microservices? Explain advantages and disadvantages

Medium

Microservices architecture structures an application as a collection of loosely coupled, independently deployable services, each running its own process and communicating via lightweight protocols.

Java

How do you handle latency in Microservices?

Hard

Latency in microservices is caused by network calls, serialization, and service chain depth. Multiple strategies can reduce latency.

Java

What is the Circuit Breaker pattern and how do you implement it?

Hard

Circuit Breaker prevents cascading failures in distributed systems by failing fast when a downstream service is unavailable, allowing the system to recover gracefully.

Java

What happens when a Microservice is down? How do you handle it?

Hard

When a microservice is down, you need strategies for graceful degradation, failover, and recovery to maintain system stability.

Java

How do you handle concurrency in MongoDB?

Hard

MongoDB handles concurrency through document-level locking, optimistic concurrency control with versioning, and atomic operations.

Java

How do you set up Spring metrics and alerts for memory issues?

Hard

Spring Boot Actuator with Micrometer provides metrics that can be exported to monitoring systems like Prometheus and visualized in Grafana with alerting.

Java

Explain OAuth 2.0 and Spring Security implementation

Hard

OAuth 2.0 is an authorization framework that enables secure, limited access to user accounts. Spring Security provides comprehensive OAuth 2.0 support for both clients and resource servers.

Java

Microservices Interview Tips