Senior Full-Stack Java | Spring Boot | AWS | React | AI Integration | Security
Hello! I'm Deepak Kumar, a Senior Software Engineer and Full-Stack Developer with 8+ years of professional experience building scalable backend systems, cloud-native applications, APIs, and modern web applications.
I specialize in Java, Spring Boot, Spring Security, React, AWS, microservices, and cloud-native development, with a strong focus on building secure, reliable, high-performance applications.
After several years away from Upwork, I'm now actively returning to the platform and focusing on helping businesses build and modernize their software using modern Java/Spring technologies, cloud platforms, AI integrations, and secure full-stack architectures.
๐ What I Can Help You Build
Enterprise Java & Spring Boot applications
RESTful APIs and microservices
Secure applications with Spring Security
OAuth 2.0, OpenID Connect, JWT and SSO
React-based web applications and dashboards
AWS cloud-native applications
Docker & Kubernetes deployments
CI/CD pipelines and DevOps automation
AI/LLM integrations into existing applications
AI-powered features, APIs and automation
Database design and optimization
High-performance and highly scalable systems
Legacy application modernization
Third-party API integrations
Real-time applications using WebSockets
Event-driven architectures with Kafka, Kinesis, RabbitMQ, etc.
๐ป Core Technology Stack
Backend
Java 8/11+
Spring Boot
Spring Framework
Spring Data
Spring Security
Hibernate / JPA
REST APIs
Microservices
WebSockets
SOAP / Web Services
Frontend
React
JavaScript
HTML5 / CSS3
Bootstrap
Thymeleaf
Security
Spring Security
OAuth 2.0
OpenID Connect
JWT
SSO
LDAP / CAS
Role-based access control
API security
Cloud & DevOps
AWS
Google Cloud Platform (GCP)
Docker
Kubernetes
ECS
Lambda
API Gateway
CloudFront
Route 53
SQS / SNS
DynamoDB
S3
Athena
Redshift
Aurora
CI/CD
Jenkins
Bamboo
CircleCI
SonarQube
Databases
PostgreSQL
Oracle
MySQL
MongoDB
Cassandra
Redis
DynamoDB
Redshift
Athena / S3
Messaging & Streaming
Apache Kafka
AWS Kinesis
RabbitMQ
Apache Camel
Event-driven architectures
๐ค AI & Modern Application Development
I'm particularly interested in helping companies bring AI capabilities into existing Java/Spring applications rather than rebuilding everything from scratch.
Examples include:
Integrating LLM/AI APIs with Spring Boot
AI-powered REST APIs
Intelligent search and document processing
AI assistants and chat functionality
RAG-based application architectures
Connecting AI services with existing enterprise systems
AI workflow automation
Secure AI integrations
Building React interfaces for AI-powered applications
โก Performance & Reliability
I also have experience analyzing and improving application performance using tools such as:
JMeter
JProfiler
AWS X-Ray
Gatling
GTMetrix
I focus on identifying bottlenecks across the application, database, API, infrastructure, and cloud layers rather than treating performance problems at only the code level.
โญ Why Work With Me?
Quality First: I focus on writing maintainable, production-ready code rather than simply making something work.
Problem Solving: I enjoy debugging complex problems, understanding the root cause, and designing practical solutions.
Clear Communication: I believe good communication is just as important as good code. I keep clients informed about progress, challenges, and technical decisions.
Security Mindset: Security is considered from the architecture and API design stage, not added as an afterthought.
Cloud & Scalability: I can work across application and infrastructure layers, from Spring Boot services all the way to AWS deployment and scaling.
Business-Focused: My goal isn't just to deliver code. It's to understand what you're trying to achieve and build a solution that provides real business value.
๐ง Looking for help with Java, Spring Boot, AWS, React or AI?
Whether you're building a new application, modernizing a legacy Java system, securing APIs, migrating to the cloud, improving performance, or adding AI capabilities to an existing product, I'd be happy to discuss your requirements.
Let's build something reliable, secure, scalable, and future-ready.
Web Service
Spring Cloud
Spring Boot
Database Design
Hibernate
Angular
JavaScript
Core Java
Web Development
Node.js
JUnit
API
Amazon Web Services
React
AI Implementation
AI Agent Development
GitHub Copilot
Claude
ChatGPT API
Spring Security
AWS Lambda
Oracle PLSQL
Gundam Raju S.
Hyderabad, India
$18/hr
4.3
23 jobs
Spring Boot Specialist | 7+ Years of Experience | Microservices | Event-Driven Architecture
Iโm a seasoned Java Backend Developer with over 7 years of hands-on experience in designing, developing, and deploying scalable RESTful APIs and microservices using Spring Boot and the Java ecosystem.
๐ ๏ธ Iโve architected and delivered robust enterprise applications used in banking, finance, and retail โ handling everything from database modeling to CI/CD automation and cloud deployments on AWS and on-prem environments.
๐ What I bring to the table:
๐ก End-to-end API development with Spring Boot, JPA, and Hibernate
๐ Kafka-based event-driven systems for high-volume processing
๐งช Quality-focused development with 90%+ unit test coverage, SonarQube, and Cypress
๐ CI/CD pipelines with Jenkins, Docker, and Gradle
๐ก๏ธ Secure systems using JWT, OAuth2, and role-based access control
โ๏ธ Experience deploying Microservices on AWS EC2, S3, Lambda, and Docker Compose setups
๐งช My tech solutions have powered:
โ๏ธ Chat-based web platforms using WebSockets and STOMP with real-time messaging
โ๏ธ E-commerce backend APIs including product catalog, cart, and checkout modules
โ๏ธ NetSuite integrations for syncing orders, inventory, and CSV file processing
โ๏ธ Tax calculation integration within e-commerce checkout flows
โ๏ธ Advanced cart and discount logic, including promo codes and gift card redemption
โ๏ธ Swagger/OpenAPI documentation for seamless API consumption
โ๏ธ Multi-locale & translation-ready APIs using Google Cloud Translation API
โ๏ธ Gift card system development: both Customer-to-Customer and Business-to-Customer models
โ๏ธ Robust scheduling features for email delivery and status updates
Skills :
Java Spring Boot
Spring Batch
Spring Data JPA
REST API Development
Apache Kafka
Microservices Architecture
Event-Driven Architecture
AWS (EC2, S3, Lambda)
Docker & Docker Compose
Jenkins CI/CD
OAuth2 & JWT
PostgreSQL / MySQL / Oracle
MongoDB / DynamoDB
JUnit 5 & Mockito
SonarQube
Swagger & Postman
Liquibase / Flyway
GitLab / Bitbucket / Git
System Design
Clean Architecture
Spring Boot
Spring Framework
Java
Spring Batch
Spring Data MongoDB
Gradle
Spring MVC
Spring Security
Core Java
Spring Cloud
Microsoft Outlook Development
API Integration
Redis
Sonu R.
Hyderabad, India
$80/hr
4.9
32 jobs
I am a Senior Full-Stack Engineer with 11+ years of experience delivering scalable enterprise applications, modern web solutions, and advanced blockchain/Web3 systems.
My expertise spans Java Spring Boot microservices, Node.js, Vue/React, Hyperledger Fabric, Ethereum, Pega BPM, and UIPath automation.
I build high-performance, secure, and maintainable solutions with strong architecture, quality coding, and reliable delivery.
๐ฅ๏ธ FULL-STACK DEVELOPMENT (PRIMARY EXPERTISE)
11+ years of experience in enterprise & web application development
Java Spring Boot (REST APIs, Microservices, Spring Security)
Node.js / Express backend services
Front-end: Vue.js, React.js, AngularJS
Microservices (Spring Cloud)
JWT / OAuth2 / RBAC authentication
MySQL, PostgreSQL, MongoDB
Docker, Kubernetes, CI/CD pipelines
Responsive UI (HTML5, CSS3, JavaScript, Bootstrap)
๐ BLOCKCHAIN, WEB3 & DECENTRALIZED TECH
Hyperledger Fabric & Hyperledger Composer
Ethereum Smart Contracts (Solidity)
Web3.js & Ethers.js integrations
DApp development (React/Vue + Web3)
ERC20, ERC721, ERC1155 token development
Smart contract audits (Hardhat, Truffle)
Crypto wallet interactions & blockchain APIs
Chaincode development & blockchain network setup
Docker/K8s for blockchain deployments
IBM Blockchain Essentials Certified
โ๏ธ PEGA BPM EXPERTISE (CLSA, CSSA, CSA)
SmartDispute, CPM frameworks
Workflow automation & decisioning
UI development (Harness, Sections)
Performance tuning (Tracer, PAL, SMA)
Rule migration, patching, packaging
Hotfix installation & production support
๐ป BACKEND / ENTERPRISE ENGINEERING
Java, J2EE, EJB, Hibernate, JDBC
Spring Boot, Spring Security, Spring Data JPA
Kafka, RabbitMQ
REST / SOAP services
WebSphere, WebLogic, Tomcat, JBOSS
๐ค RPA / UIPath AUTOMATION
UIPath Certified (Basic, Advanced, Orchestrator)
Automations for finance, insurance & operations
UIPath + Pega + backend integrations
API-based automation workflows
โ๏ธ WHY CLIENTS CHOOSE ME
11+ years of senior-level experience
Strong full-stack + blockchain + enterprise expertise
Clear communication & excellent client collaboration
Fast, reliable, and detail-oriented
Architecture โ Development โ Deployment (end-to-end ownership)
Clean, scalable, maintainable codebase
Team leadership experience
๐ WHAT I CAN BUILD FOR YOU
Full-Stack Applications
Java Spring Boot microservices
Node.js + Vue/React platforms
Admin dashboards & web portals
API-driven architectures
Blockchain / Web3
Ethereum smart contracts
Hyperledger Fabric networks
Web3-enabled dashboards & apps
NFT platforms & token systems
Pega & Automation
BPM workflows and UI development
UIPath automation bots
Enterprise process automation
UiPath
Business Process Management
React Native
Pega PRPC
Robotics
React
Blockchain
JavaScript
API Integration
Node.js
CSS 3
HTML5
Python
Pega Platform
Data Scraping
Srinivas R.
Hyderabad, India
$25/hr
4.0
15 jobs
I'm Srinivas and I'm a seasoned Full Stack developer with a keen eye for detail and great coding skills. With the use of the most effective Front end tools and approaches,
๐ ต๐๐ พ๐ ฝ๐ ๐ ด๐ ฝ๐ ณ ๐ ป๐ ฐ๐ ฝ๐ ถ๐๐ ฐ๐ ถ๐ ด๐
โ Angular JS, NgBootstrap, ChartsJS
โ HTML5, CSS3, JavaScript, TypeScript
โ Bootstrap, Material
โ React Native
๐ ฑ๐ ฐ๐ ฒ๐ บ๐ ด๐ ฝ๐ ณ ๐ ป๐ ฐ๐ ฝ๐ ถ๐๐ ฐ๐ ถ๐ ด๐
โ Node JS, Express JS, Nest JS
โ MongoDB, Mongoose
โ Java, Servlets, JDBC, Hibernate,
โ Spring Boot, Spring Cloud, Spring JPA
๐๐ฎ ๐พ๐ค๐ง๐ ๐ ๐๐ซ๐/๐๐ฅ๐ง๐๐ฃ๐ ๐ฝ๐ค๐ค๐ฉ ๐๐ญ๐ฅ๐๐ง๐ฉ๐๐จ๐:
๐ฅ ๐ ๐ซ๐๐ฆ๐๐ฐ๐จ๐ซ๐ค๐ฌ: Spring boot, Hibernate, Web Services, JPA, JMX Client, Spring MVC, Spring Rest, Spring data, Spring Gateway, etc
๐ฅ ๐๐๐ฏ๐๐ฉ๐ฌ: Kubernetes, Docker
๐ฅ ๐๐๐ญ๐๐๐๐ฌ๐: SQL Server 2008, MySQL, Oracle
๐ฅ ๐๐ญ๐ก๐๐ซ ๐๐จ๐จ๐ฅ๐ฌ & ๐๐๐๐ก๐ง๐จ๐ฅ๐จ๐ ๐ข๐๐ฌ: SVN, GIT, PostMan, JMeter
๐ฅ ๐๐๐๐ฎ๐ซ๐ข๐ญ๐ฒ ๐๐จ๐๐ฎ๐ฅ๐๐ฌ: Spring Security
๐ฅ ๐๐๐ฌ๐ญ๐ข๐ง๐ : JUnit, Mockito
๐ฅ Payment Gateways: Paytm Payment Gateway, RazorPay, Secure Pay,
๐ฅ Maps Integration: Google Map, Mapbox
๐ฅ Third-party Integrations: SendGrid API, Mandril Email API, TextLocal API, WhatsApp Business API
๐ Let's get connected via a call and discuss your project.
Have a project?
๐ง๐ฒ๐น๐น ๐บ๐ฒ ๐ฎ๐ฏ๐ผ๐๐ ๐ถ๐
Upwork Invites are working properly, so I'm eager to get them from you!
Cheers,
Srinivas
Node.js
React Native
Angular
MongoDB
MySQL
Java
Mobile App Development
React
Spring Boot
SQL
Database
Core Java
Web Development
Suresh M.
Hyderabad, India
$18/hr
4.4
2 jobs
I have 15+ years of experience in developing Internet/Intranet, Client/Server and Distributed Architecture Applications using Java, JFC/Swing, AWT,Java FX and Java EE,Spring Boot,EJB3, JPA,Hibernate, Spring MVC,Spring Security,Rest Services,Technologies
Good exposure to HealthCare, Payment, DICOM & AUTOSAR domains.
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