Chapter 20: The Final Boss: Senior Engineering Interviews

In this final chapter, we focus on mastering the Senior Backend Engineering interview process. You'll learn to effectively present your microservice architecture on a whiteboard...

Chapter 17: Security: Surviving a Data Breach

In this chapter, you will address a critical security breach caused by a SQL injection attack. Learn how to secure passwords with BCrypt hashing and...

Chapter 18: Microservices: The Fall of the Monolith

In this chapter, we tackle the challenges of scaling an e-commerce platform by transitioning from a monolithic to a microservices architecture. You'll learn to divide...

Chapter 19: Reactive Streams: The End of Blocking

This chapter addresses the challenge of scaling an e-commerce application to handle 10,000 concurrent connections by adopting the Reactive Paradigm. You'll learn to transition from...

Chapter 14: JVM Internals: Surviving Black Friday

Imagine it's Black Friday, and your e-commerce platform faces 10,000 checkout requests per second. Suddenly, the server crashes with a `java.lang.OutOfMemoryError`. This chapter explores the...

Chapter 15: Concurrency: Surviving the Flash Sale

In this chapter, you tackle concurrency issues that arise during a Flash Sale scenario, focusing on diagnosing and resolving Race Conditions. You'll learn to use...

Chapter 16: Metaprogramming: Building a Mini-Framework

In this chapter, you will create a mini-framework to automate HTTP route management, similar to how Spring Boot operates. You'll explore Java Reflection to dynamically...

Chapter 10: Testing the Store, Build Tools, and Project Sanity

As your e-commerce application scales, manual testing becomes impractical. This chapter teaches you to use JUnit for unit tests, Mockito for mocking components like PaymentGateways,...

Chapter 11: Networking the Store: HTTP Clients, JSON, and APIs

In this chapter, you will extend the e-commerce application by integrating it with external APIs for shipping and inventory. Learn to use Java's HttpClient to...

Chapter 12: Modernizing the Store: Records, Pattern Matching, and New Java

In this chapter, you'll transform an e-commerce codebase by using Java Records to eliminate repetitive boilerplate code. You'll also streamline complex conditional logic with Pattern...