Master Technical Skills That Matter

Java Core Fundamentals

OOP, collections, generics, exceptions — the complete Java foundation every backend interview tests.

Java Concurrency & Multithreading

Threads, executors, locks, volatile, and the Java memory model — the hardest Java interview topic made clear.

Java Streams & Functional Programming

Lambdas, streams, optionals, method references — write modern Java and answer every functional-style interview question.

Java 21 — New Features

Virtual threads, records, sealed classes, pattern matching — everything new in Java 17–21 that interviewers now ask about.

Spring Boot REST API Development

Build versioned REST APIs with Spring Boot 3 — controllers, validation, error handling, OpenAPI docs.