JavaBackend Prep

Core Java

Java Basics OOPs (Design-Focused) Multithreading & Concurrency Java Networking Exception Handling Java Collections Framework Strings & Regular Expressions Advanced Java File I/O & Serialization Annotations & Reflection JDBC Java Testing (JUnit, Mockito) Web Development Java 8 & Functional Programming Design Patterns (Backend-Relevant) Java Security Cloud Computing Fundamentals Spring Framework & Hibernate

Spring & Hibernate

Spring Core, DI & Bean Lifecycle Spring Boot Auto-configuration & Config REST API Design, Validation & ControllerAdvice Transactions & Propagation Hibernate & JPA Internals Lazy vs Eager Loading & the N+1 Problem Caching & Performance Tuning Spring Security & JWT

Database & Caching

SQL Indexing & Optimization Transactions & Isolation Levels Hibernate Performance Tuning Redis & Caching Strategies Cache Invalidation Scenarios Flyway/Liquibase Migrations Elasticsearch Basics

System Design

Fundamentals & Estimation Scalability, Caching & Load Balancing Data Stores & Messaging Microservices & Resilience Low-Level Design High-Level Design 15-Day Strategy & Interview Framework

Docker, Cloud & DevOps

Docker for Java Applications Deploying Spring Boot on AWS Kubernetes Basics CI/CD Pipelines Logging, Monitoring, Tracing, Prometheus & Grafana Terraform Fundamentals Mini-guide: Shipping a Spring Boot Microservice to Production

Tools

15-day System Design plan Bookmarks & revisit Download PDFs

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