Java Backend Engineering

Strong Java backends combine language mastery with runtime awareness and framework discipline. This pillar sequences collections and concurrency, JVM behavior, and Spring Boot production patterns so you can reason about performance and correctness under load.

Audience: Java engineers building services with Spring Boot.

Curriculum

1. Java Collections Overview
2. HashMap Internals
3. ArrayList vs LinkedList — When Contiguous Beats Nodes
4. ConcurrentHashMap Internals — Concurrent Hashing Without Global Locks
5. Java Streams API Deep Dive
6. Java Memory Model & Virtual Threads
7. Synchronization, Locks & Deadlocks
8. CompletableFuture Patterns
9. Java Executor Framework — Thread Pools Done Right
10. JVM Architecture & Class Loading
11. G1GC & JVM Performance Tuning
12. Spring Core Dependency Injection
13. Spring Boot Best Practices

By Shubham Jain. Last reviewed 2026-07-15.

Shubham Jain · Learning Lab