Himanshu Sahu HimanshuSahu-1

Hi 👋, I'm Himanshu Sahu

Java Backend Developer | Spring Boot | Microservices | AWS

👨‍💻 About Me

I am a Java Backend Developer focused on building scalable, secure, and reliable backend applications using Java, Spring Boot, Microservices, REST APIs, and SQL databases.

I enjoy designing backend systems, developing APIs, working with distributed architectures, implementing authentication and authorization, and optimizing application performance.

Currently focused on strengthening my expertise in Java, Spring Boot, Microservices, Kafka, System Design, AWS, and backend development best practices.

🎯 Career Focus

☕ Java Backend Development
🚀 Spring Boot & Microservices
🔗 RESTful API Development
📨 Apache Kafka & Event-Driven Architecture
🗄️ MySQL, JPA & Hibernate
🔐 Spring Security, JWT & OAuth 2.0
☁️ AWS Cloud & Application Deployment
🐳 Docker & Kubernetes
⚙️ CI/CD with Jenkins
🧩 System Design & Distributed Systems

🛠️ Technical Skills

🔹 Programming

Java 8 / 17
SQL
Object-Oriented Programming
Data Structures & Algorithms

🔹 Backend Development

Spring Boot
Spring MVC
Spring Security
Hibernate
JPA
RESTful APIs
Microservices

🔹 Messaging & Distributed Systems

Apache Kafka
Event-Driven Architecture
Saga Pattern
Circuit Breaker Pattern
Distributed Systems

🔹 Databases

MySQL
SQL
Database Design
Query Optimization
Hibernate / JPA

🔹 Security

Spring Security
JWT Authentication
OAuth 2.0
Role-Based Access Control (RBAC)

🔹 Cloud & DevOps

AWS EC2
AWS S3
AWS RDS
AWS CloudWatch
AWS IAM
Docker
Kubernetes
Jenkins
Git & GitHub
Maven

🔹 Testing & Development Tools

JUnit 5
Mockito
Postman
Swagger / OpenAPI
IntelliJ IDEA
Eclipse

📂 Featured Projects

🛒 CloudCart – E-Commerce Backend System

Tech Stack: Java, Spring Boot, Microservices, MySQL, Apache Kafka

Developed a scalable e-commerce backend using Spring Boot and Microservices.
Built independent services for Product, Cart, Order, Payment, and User Management.
Developed secure RESTful APIs for order and payment workflows.
Implemented authentication and authorization using Spring Security and JWT.
Integrated Apache Kafka for asynchronous communication between services.
Implemented validation, exception handling, database relationships, and query optimization.
Added unit and integration testing using JUnit and Mockito.

🏥 Doctor Appointment Backend System

Tech Stack: Java, Spring Boot, Microservices, MySQL, Apache Kafka

Developed backend services for Doctor, Patient, Appointment, Booking, and Payment management.
Designed REST APIs for appointment scheduling and booking workflows.
Integrated Apache Kafka for asynchronous booking confirmation and notification workflows.
Implemented Spring Security for secure API communication.
Added centralized exception handling and request validation.
Created unit and integration tests using JUnit and Mockito.

🔐 API Gateway & Authentication Service

Tech Stack: Java, Spring Boot, Spring Security, MySQL, Hibernate, JPA

Developed a centralized API Gateway for communication between microservices.
Implemented JWT-based authentication and role-based authorization.
Built REST APIs for user registration, login, and token management.
Used Hibernate and JPA for database persistence.
Developed unit tests using JUnit and Mockito.

🧠 Backend Concepts I Practice

OOP & SOLID Principles
Exception Handling
REST API Design
Authentication & Authorization
Microservices Architecture
Event-Driven Architecture
Database Optimization
API Gateway
Distributed Systems
Saga Pattern
Circuit Breaker Pattern
Caching Concepts
Multithreading & Concurrency
System Design
Design Patterns

📚 Currently Learning

Advanced Java
Spring Boot
Spring Security
Microservices
Apache Kafka
System Design
AWS
Docker & Kubernetes
Data Structures & Algorithms

📊 GitHub Stats

💻 What I Build

I use GitHub to build and share projects related to:

Java Backend Development
Spring Boot
Microservices
REST APIs
Apache Kafka
Database Systems
Authentication & Authorization
System Design
Cloud & DevOps

🤝 Open to Opportunities

I am interested in opportunities related to:

Java Backend Developer
Spring Boot Developer
Backend Engineer
Microservices Developer
Software Engineer
Java Developer

I am looking forward to working on challenging backend systems, improving my engineering skills, and contributing to scalable software solutions.

🚀 Goals

Build production-ready Java backend applications
Strengthen Microservices and distributed-system knowledge
Improve System Design skills
Build scalable REST APIs
Gain deeper experience with Apache Kafka
Improve AWS and cloud deployment skills
Continue contributing to open-source projects

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