☕ Java Backend Interview Roadmap

A structured path to crack Java backend interviews and level up your engineering skills.

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Core Java

Beginner

OOP Principles

Collections Framework

Multithreading & Concurrency

Exception Handling

Java 8+ Features (Streams, Lambda)

Spring & Spring Boot

Intermediate

Dependency Injection

Spring Boot Annotations

REST APIs with Spring MVC

Spring Data JPA & Hibernate

Exception Handling & Validation

Database & ORM

Intermediate

MySQL/PostgreSQL

Entity-Relationship Modeling

Hibernate & JPA Mappings

Transaction Management

Query Optimization

Security

Advanced

Spring Security

JWT Authentication

Role-Based Access Control

OAuth2 Basics

System Design & Architecture

Advanced

RESTful Design Principles

Microservices Architecture

API Gateway & Service Registry

Scalability & Load Balancing

Monitoring & Logging

Debugging & Testing

Essential

Unit Testing with JUnit

Integration Testing

Mockito for Mocking

Debugging Techniques

Projects & Portfolio

Practical

Design and Build APIs

CRUD Projects with Spring Boot

Documentation using Swagger

Showcase GitHub Contributions

🚀 Keep refining, building, and sharing your backend journey.