Career AcceleratorAdvanced

Java Backend Mastery

JVM internals, concurrency, APIs, and production patterns in one academy track.

A complete backend Java pathway that combines language fluency, runtime internals, concurrency, and system-facing application design.

60 lessons•12 modules•433 min
Start First LessonBack to Academy

Designed for

Java engineers aiming for senior backend and platform roles.

What you unlock

  • Deeper intuition for memory, GC, threading, and performance bottlenecks
  • A practical roadmap from language fundamentals to architecture-facing Java
  • Production-ready lessons that connect JVM behavior to backend reliability

Curriculum Map

A structured path that feels worth paying for

Every module is ordered to build confidence, not just collect content. Start with the right fundamentals, deepen into the mechanics, then pressure-test your thinking with realistic engineering trade-offs.

Module 1

1. Fundamentals

7 lessons•43 min
1

Introduction to Java

Beginner • 6 min read

2

JVM, JDK, JRE (Deep Explanation)

Beginner • 6 min read

3

Primitives, Wrappers, and Autoboxing

Beginner • 6 min read

4

Control Flow and Branch Prediction

Beginner • 6 min read

5

Arrays and CPU Cache Locality

Beginner • 6 min read

6

Java is Strictly Pass-by-Value

Beginner • 6 min read

7

Strings (Immutability & String Pool)

Beginner • 7 min read

Module 2

2. OOP

4 lessons•24 min
1

Mastering OOP: Inheritance and Polymorphism

Intermediate • 6 min read

2

Encapsulation and Access Modifiers

Beginner • 6 min read

3

Polymorphism: Overloading vs Overriding

Beginner • 6 min read

4

Interfaces vs Abstract Classes

Beginner • 6 min read

Module 3

3. Advanced Core

5 lessons•29 min
1

Deep Dive: The Collections Framework

Advanced • 6 min read

2

ArrayList vs LinkedList Internals

Advanced • 6 min read

3

HashMap Internals: Hashing, Collisions, and Treeification

Advanced • 6 min read

4

Advanced Exception Handling

Intermediate • 5 min read

5

Generics and Type Erasure

Advanced • 6 min read

Module 4

4. Internals

3 lessons•17 min
1

Memory Management (Heap, Stack, Metaspace)

Advanced • 6 min read

2

Garbage Collection (G1, CMS, ZGC)

Advanced • 6 min read

3

The ClassLoader Subsystem

Advanced • 5 min read

Module 5

5. Concurrency

3 lessons•19 min
1

Multithreading & Concurrency Mastery

Advanced • 7 min read

2

Advanced Locking: ReentrantLock and StampedLock

Advanced • 6 min read

3

The Volatile Keyword and the JMM

Advanced • 6 min read

Module 6

6. Java 8+

4 lessons•22 min
1

Modern Java: Streams and Lambdas

Advanced • 6 min read

2

Lambda Expressions and Functional Interfaces

Beginner • 6 min read

3

Mastering Optional: Null Safety

Intermediate • 5 min read

4

Asynchronous Java: CompletableFuture

Advanced • 5 min read

Module 7

7. Design Patterns

1 lessons•6 min
1

Architectural Patterns: Singleton to Strategy

Intermediate • 6 min read

Module 8

8. Real-World

1 lessons•6 min
1

Writing Production-Grade Java

Advanced • 6 min read

Module 9

9. Interview Prep

3 lessons•17 min
1

The Staff Engineer Interview Playbook

Intermediate • 6 min read

2

The equals() and hashCode() Contract

Intermediate • 5 min read

3

Designing Truly Immutable Classes

Advanced • 6 min read

Module 10

10. Projects

4 lessons•25 min
1

Mini Project: LRU Cache

Advanced • 7 min read

2

Mini Project: Multithreaded Task Executor

Advanced • 6 min read

3

Mini Project: Token Bucket Rate Limiter

Advanced • 6 min read

4

Mini Project: In-Memory Key-Value Store (Redis Clone)

Advanced • 6 min read

Module 11

Java Backend Mastery

9 lessons•71 min
1

Java Memory Management Deep Dive: Heap, GC, and Production Tuning

Advanced • 9 min read

2

The Java Memory Model (JMM): Volatile, Happens-Before, and Visibility

Advanced • 8 min read

3

Java GC Tuning: From G1 to ZGC — Eliminating Pause-Time Spikes

Advanced • 11 min read

4

Java Virtual Threads: High-Concurrency without the Complexity

Advanced • 7 min read

5

HikariCP Tuning: Diagnosing Database Connection Pool Exhaustion

Advanced • 8 min read

6

Java Flight Recorder (JFR): Continuous Profiling with Zero Overhead

Advanced • 7 min read

7

Cgroup Awareness in Java: Avoiding OOM Kills

Advanced • 6 min read

8

Zero-Copy in Netty: The Backbone of High-Speed Java Networking

Advanced • 7 min read

9

Java Heap Dump Analysis: A Step-by-Step Guide to Finding Memory Leaks

Advanced • 8 min read

Module 12

JVM & Performance

16 lessons•154 min
1

HikariCP Tuning: The Math behind Connection Pools

Advanced • 7 min read

2

LMAX Disruptor: How to Process 6M Transactions/Sec on One Thread

Advanced • 7 min read

3

Modern Java GC: G1 vs. ZGC - Choosing the Right Collector

Advanced • 8 min read

4

Spring Boot Timeouts: The Production Guide for HTTP, DB, Redis, and Kafka

Advanced • 10 min read

5

Database Connection Pool Tuning: HikariCP, PostgreSQL, and Traffic Spikes

Advanced • 9 min read

6

Spring Boot Production Readiness Checklist: Timeouts, Pools, Health Checks, and Observability

Advanced • 7 min read

7

Java Concurrency Patterns: CompletableFuture, Structured Concurrency, and Thread-Safe Design

Advanced • 8 min read

8

Spring Security OAuth2 and JWT: Production Implementation Guide

Advanced • 9 min read

9

Scaling Spring Boot Applications to Handle 10 Million Daily Active Users

Advanced • 11 min read

10

Java Profiling and Heap Analysis: Finding Memory Leaks and CPU Bottlenecks

Advanced • 8 min read

11

Thread Pool Exhaustion in Spring Boot: Diagnosis, Prevention, and Recovery

Intermediate • 10 min read

12

Java Streams API: Advanced Patterns and Performance

Advanced • 10 min read

13

Java Design Patterns: When to Use Them, When to Avoid Them

Intermediate • 11 min read

14

Spring Boot Performance Tuning: From 200 to 2000 RPS

Advanced • 14 min read

15

Java 21 Virtual Threads: The End of Reactive Programming Boilerplate

Advanced • 13 min read

16

Sync vs Async in Java: CompletableFuture, Reactive Streams, and Virtual Threads

Advanced • 12 min read