Hire the Best Vaadin Framework Specialists in Hyderabad, IN

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. 🚀 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. 💻 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 🤖 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 ⚡ 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. ⭐ 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. 🔧 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.

Backend developer with 5 years of professional software engineering experience building APIs, backend services, distributed systems, and microservices. I work primarily with Java, Spring Boot, Python, REST APIs, PostgreSQL, and Apache Kafka, with experience developing production software and event-driven systems. I also build Unity (C#) projects focused on gameplay systems, simulation mechanics, and management-style games. This includes a published Unity simulation project, Cinema Rush. I can help with: * Backend development and REST APIs * Java / Spring Boot development * Python backend development * Microservices and event-driven systems * Bug fixing, debugging, and existing codebase improvements * Unity gameplay systems and technical game development I focus on clean, maintainable implementations, clear communication, and solving problems without unnecessary complexity.

Spring Boot Specialist | 7+ Years of Experience | Microservices | Event-Driven Architecture I’m 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. 🛠️ I’ve architected and delivered robust enterprise applications used in banking, finance, and retail — handling everything from database modeling to CI/CD automation and cloud deployments on AWS and on-prem environments. 🔍 What I bring to the table: 💡 End-to-end API development with Spring Boot, JPA, and Hibernate 🔁 Kafka-based event-driven systems for high-volume processing 🧪 Quality-focused development with 90%+ unit test coverage, SonarQube, and Cypress 🚀 CI/CD pipelines with Jenkins, Docker, and Gradle 🛡️ Secure systems using JWT, OAuth2, and role-based access control ☁️ Experience deploying Microservices on AWS EC2, S3, Lambda, and Docker Compose setups 🧪 My tech solutions have powered: ✔️ Chat-based web platforms using WebSockets and STOMP with real-time messaging ✔️ E-commerce backend APIs including product catalog, cart, and checkout modules ✔️ NetSuite integrations for syncing orders, inventory, and CSV file processing ✔️ Tax calculation integration within e-commerce checkout flows ✔️ Advanced cart and discount logic, including promo codes and gift card redemption ✔️ Swagger/OpenAPI documentation for seamless API consumption ✔️ Multi-locale & translation-ready APIs using Google Cloud Translation API ✔️ Gift card system development: both Customer-to-Customer and Business-to-Customer models ✔️ 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

14+ years of experience delivering full-stack solutions for startups, SaaS platforms, and enterprise clients across fintech, healthcare, and e-commerce. I specialize in Java (Spring Boot, Microservices) for backend and React.js / Angular for modern, responsive frontends. Scalable APIs, secure architectures, and high-performance UIs built to meet business-critical goals. Whether you're launching an MVP or scaling an enterprise platform, I deliver clean, reliable, production-ready code. Let’s build something impactful.

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.

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. 🖥️ 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) 🔗 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 ⚙️ 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 💻 BACKEND / ENTERPRISE ENGINEERING Java, J2EE, EJB, Hibernate, JDBC Spring Boot, Spring Security, Spring Data JPA Kafka, RabbitMQ REST / SOAP services WebSphere, WebLogic, Tomcat, JBOSS 🤖 RPA / UIPath AUTOMATION UIPath Certified (Basic, Advanced, Orchestrator) Automations for finance, insurance & operations UIPath + Pega + backend integrations API-based automation workflows ✔️ 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 → Development → Deployment (end-to-end ownership) Clean, scalable, maintainable codebase Team leadership experience 🚀 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