🚀 Spring Boot Backend Engineering Journey

This repository documents my journey of mastering Spring Boot and Backend Engineering from fundamentals to advanced microservices architecture.

The course covers enterprise backend development concepts, including:

• REST APIs
• Security
• Microservices
• Distributed Systems
• DevOps
• Cloud Deployment

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📑 Table of Contents

• Tech Stack
• Course Modules
• Projects Built
• Architecture Covered
• Tools Used
• Goal

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🧑‍💻 Tech Stack

Backend

• Java
• Spring Framework
• Spring Boot
• Spring MVC
• Spring Data JPA
• Hibernate
• Spring Security
• Spring Cloud

Database

• H2 (In-Memory Database)
• MySQL
• PostgreSQL
• Redis

Messaging

• Apache Kafka

DevOps & Cloud

• Docker
• Kubernetes
• AWS
• CI/CD Pipelines

Testing

• JUnit
• Mockito
• Integration Testing
• TestContainers

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📚 Course Modules

Module 1 – Introduction to Spring & Spring Boot

• Introduction to Spring Framework
• Setting up Spring Boot Project
• Spring Beans
• Dependency Injection
• Spring Boot vs Spring Framework
• Auto Configuration
• Application Context
• Maven Build Tool

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Module 2 – Spring Boot MVC & REST APIs

• Spring MVC Architecture
• Tomcat & DispatcherServlet
• Controllers & DTO
• Service Layer Architecture
• Persistence Layer
• PUT, PATCH, DELETE APIs
• Input Validation
• Exception Handling
• API Response Transformation
• Java Streams & Lambda

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Module 3 – Hibernate & Spring Data JPA

• Installing MySQL & Database Setup
• Hibernate ORM
• Entities & Tables
• JPA Repositories
• Dynamic Query Methods
• Pagination & Sorting
• Projection
• Entity Lifecycle
• OneToOne, OneToMany, ManyToMany
• Cascading
• Fetch Types
• N+1 Query Optimization

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Module 4 – Production Ready Spring Boot

• Spring Boot DevTools
• Auditing with Hibernate Envers
• Third Party API Integration
• Logging in Spring Boot
• Spring Boot Actuator
• Swagger & OpenAPI Documentation

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Module 5 – Spring Security Fundamentals

Security concepts covered:

• CSRF
• XSS
• SQL Injection

Topics:

• Spring Security Architecture
• Security Filter Chain
• JWT Authentication
• Login & Signup with JWT
• Request Authentication

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Module 6 – Advanced Spring Security

• Refresh Tokens
• Access Tokens
• OAuth2 Login (Google)
• Session Management
• Role Based Authorization
• Permissions & Authorities
• Method Level Security

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Module 7 – Spring Boot Testing

• Unit Testing
• Integration Testing
• JUnit Framework
• AssertJ Library
• Mockito Mocking
• TestContainers
• Code Coverage using Jacoco

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Module 8 – Deployment & CI/CD

• AWS RDS Setup
• Spring Profiles
• Deployment on AWS Elastic Beanstalk
• Load Balancers
• Auto Scaling
• CI/CD using AWS CodePipeline
• Database Migration using Flyway

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Module 9 – Spring AI & RAG

• Generative AI Basics
• Spring AI
• ChatClient
• Embeddings
• Vector Search
• Retrieval Augmented Generation (RAG)
• Tool Calling

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Module 10 – Aspect Oriented Programming (AOP)

• AOP Concepts
• Pointcuts
• Advice
• Spring Proxies
• Real World Use Cases

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Module 11 – Caching & Transaction Management

• Spring Boot Caching
• Redis Cache
• ACID Properties
• Transaction Management
• Isolation Levels
• Optimistic & Pessimistic Locks

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Module 12 – Microservices Architecture

• Microservices Fundamentals
• Service Registration with Eureka
• API Gateway
• Feign Client
• Resilience4j
• Circuit Breaker
• Retry
• Rate Limiting

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Module 13 – Advanced Microservices

• API Gateway Filters
• Centralized Config Server
• Dynamic Configuration Refresh
• Distributed Tracing (Zipkin)
• Centralized Logging (ELK Stack)

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Module 14 – Apache Kafka

• Kafka Fundamentals
• Kafka Architecture
• Kafka with Spring Boot
• Schema Registry
• Event Driven Architecture

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Module 15 – Docker

• Docker Fundamentals
• Docker Installation
• Dockerfile
• Docker Images
• Docker Compose
• Containerized Microservices

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Module 16 – Kubernetes

• Kubernetes Architecture
• Minikube Setup
• Pods
• Deployments
• ReplicaSets
• Services
• Persistent Volumes
• StatefulSets

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Module 17 – Advanced Kubernetes

• Google Kubernetes Engine (GKE)
• Kubernetes DNS
• Ingress Controllers
• ConfigMaps
• Secrets
• Kubernetes CI/CD

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Module 18 – Async Processing

• Java Executor Framework
• Task Scheduling
• Async Tasks
• Tomcat Threading Model
• Image Upload Service (Cloudinary + Google Cloud Storage)

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🧠 Projects Built

Airbnb Backend System

Features:

• Hotel Management APIs
• Booking System
• Search System
• Payment Integration
• Dynamic Pricing
• Secure Authentication

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LinkedIn Microservices System

Features:

• Microservices Architecture
• Service Discovery
• API Gateway
• Distributed Logging
• Kafka Messaging
• Kubernetes Deployment

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🧩 Architecture Covered

• Monolithic Architecture
• Layered Architecture
• Microservices Architecture
• Event Driven Architecture

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🛠 Tools Used

• IntelliJ IDEA
• MySQL
• DBeaver
• Postman
• Docker
• Kubernetes
• AWS
• GitHub

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🎯 Goal

To master production-level backend engineering using Java & Spring Boot and build scalable distributed systems.

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⭐ Support

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