Java Backend Interview Preparation Set

Get a look at one topic from the complete Java Backend Interview Preparation Set:

https://drive.google.com/file/d/1X7QZ61bww4ZHNB3IcVgGWO54LO7_QWqq/view?usp=sharing

The set is divided topic-wise, so you don't have to go through one massive document.

What's covered:

Module 1: ☕ Core Java

OOP, Collections, Java 8, Streams, Multithreading, Concurrency and other important Core Java topics.

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Module 2: 🍃 Spring Framework & Spring Boot

Spring fundamentals, IoC, Dependency Injection, Beans, Auto-Configuration, REST APIs, application lifecycle and internal working.

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Module 3: 🗄️ Spring Data JPA & Hibernate

Entity relationships, Persistence Context, Lazy vs Eager loading, Transactions, Locking, N+1 problems and other commonly asked topics.

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Module 4: 🔐 Spring Security

Authentication, Authorization, Security Filter Chain, JWT, roles, method-level security, CORS, CSRF and OAuth2.

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Module 5: 🏗️ Microservices

Service communication, API Gateway, Service Discovery, OpenFeign, WebClient, Circuit Breaker, retries, distributed transactions and event-driven architecture.

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Module 6: 📨 Kafka & Async Processing

Kafka basics, producers, consumers, consumer groups, offsets, acknowledgements, retries, DLT, idempotency and asynchronous processing.

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How the PDFs are structured:

Each topic has its own PDF, and the PDF contains the interview questions related to that topic.

For each important question, you'll find the answer along with the explanation behind it.

Depending on the topic, the PDFs include:

• Interview questions

• Detailed answers

• Concept explanations

• Internal working

• Java / Spring Boot code examples

• Real-world scenarios

• Follow-up questions

• Quick revision notes

Who is this for?

• Java developers with 2–5 years of experience

• Backend developers preparing for interviews

• Developers planning a job switch

• Anyone who already knows the basics but wants to prepare the topics properly before an interview

I made this because interview preparation can get messy pretty quickly. You end up saving YouTube videos, GitHub notes, articles and interview questions in different places.

Here, you can simply pick a topic, open its PDF, study it, and move to the next one.

You can go through the PDFs at your own pace whether you're preparing for an interview next week or slowly getting ready for your next job switch.

Spring Boot Architecture — A visual look inside the PDF: