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Advanced Java Backend Engineering

Advanced topics — implementing from scratch what most developers only use from libraries.

✅ Completed

Custom HashMap — bucket array, separate chaining, O(1) average complexity

🔨 In Progress

Custom Thread Pool — ExecutorService-like functionality

📋 Planned

Reflection API & Custom Annotations
Java NIO (Non-blocking I/O)
Spring Boot internals
Microservices (Kafka, Circuit Breaker)
System Design (URL Shortener, Chat App)