Backend Guide

Java & Spring Knowledge Boost

Java: Core concepts, Scenarios, tricky output-based questions, Scenarios on Streams, Coding problems on Arrays and Strings

Spring, Spring Boot & REST: Concepts & Scenario-based coverage with real-time cases.

Unit and Integration Testing Questions.

Functional & behavioral questions: What hiring managers usually ask.

Cheat sheets: Java + Spring condensed for last-minute prep.

Organized by experience level: Junior → Mid → Senior.

Bonus: GitHub examples, Video links, and Reference articles to go deeper.

Microservices, System Design & Design Patterns Knowledge Boost

Microservices (Concepts + Scenarios)

195 carefully curated questions and answers that cover fundamentals, edge cases, and real production scenarios.

System Design (Concepts + High-Level Designs)

85 questions and answers covering architectures and designs like Instagram and YouTube.

Real-World System Design

21 deep-dive scenarios explaining how systems like WhatsApp, Hotstar, and Uber actually work under the hood.

SOLID Principles & Design Patterns

58 questions and answers covering SOLID, design patterns, and pattern-based problem solving.

And that’s not all

You also get:

1. Reference articles for deeper understanding
2. Video links, especially for high-level system designs
3. Code examples for SOLID principles and design patterns
4. Real-time, practical examples for every major microservices concept