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✅ 8+ Years of Java Development Experience ⚡ Full-Cycle Backend Development & Architecture ⚡ AI-Powered Development for Faster Delivery & Better Code Quality 👀 Click Invite or Hire for Scalable Java Backend Solutions Looking for a Java Developer who can build scalable backend systems, SaaS platforms, enterprise applications, and cloud-native solutions designed for long-term growth? For 8+ years, I have helped startups, SaaS companies, fintech businesses, AdTech platforms, and enterprise organizations build secure, scalable, and high-performance software using Java, Spring Boot, PostgreSQL, MySQL, Kafka, GraphQL, AWS, Docker, Kubernetes, and modern cloud technologies. From backend architecture and microservices development to legacy application modernization, API integrations, troubleshooting, cloud deployments, and AI-assisted engineering, I deliver production-ready solutions built to scale. 👉 WHAT YOU GET: ✔️ Java Backend Development & Software Architecture ✔️ Spring Boot Applications & Microservices ✔️ REST APIs, GraphQL APIs & Integrations ✔️ Cloud-Native Applications using AWS ✔️ AI-Assisted Development & Automation ✔️ Legacy System Modernization ✔️ Long-Term Support, Maintenance & Optimization 🏆 KEY ACHIEVEMENTS: ✔️ 8+ years building Java, Spring Boot, and enterprise backend applications ✔️ Built scalable SaaS platforms, fintech applications, AdTech systems, and enterprise software ✔️ Maintained and enhanced 15+ production microservices ✔️ Contributed to Adstrome, TrustArc, Acquia DAM, and Digi-Docket ✔️ Designed secure APIs, event-driven systems, and scalable architectures ✔️ Improved application performance through optimization and modernization ⚙️ CORE EXPERTISE: ✔️ Java, Core Java, Java EE, Spring Boot, Spring MVC, Spring Security ✔️ Hibernate, JPA, JDBC, MyBatis, ORM Frameworks, REST APIs, GraphQL APIs ✔️ Microservices Architecture, Apache Kafka, Event-Driven Systems ✔️ PostgreSQL, MySQL, Snowflake, Query Optimization ✔️ AWS, Docker, Kubernetes, Jenkins, Maven, Gradle, Git, GitHub, Bitbucket, Version Control Systems ✔️ Authentication, Authorization, RBAC, Multi-Tenant SaaS ✔️ ZK Framework & Enterprise Web Application Development 🛠 DEVELOPMENT & MAINTENANCE: ✔️ Web Application Development & Enterprise Software Development ✔️ Spring MVC & ZK Framework Application Development ✔️ Legacy Application Maintenance, Modernization & Application Upgrades ✔️ Feature Development & Application Enhancements ✔️ Bug Fixing, Root Cause Analysis & Production Support ✔️ Performance Bottleneck Analysis & Optimization ✔️ Memory Leak Detection & Resolution ✔️ Security Vulnerability & CVE Remediation ✔️ Third-Party API Integration & Business Workflow Automation ✔️ Performance Optimization & Scalability Improvements ☁️ CLOUD & DEVOPS: ✔️ AWS Cloud Services, Docker Containerization & Containerized Application Deployment ✔️ Kubernetes Container Orchestration for Scalable Cloud Infrastructure ✔️ Linux-Based Server Systems, Linux Server Administration & Linux Server Troubleshooting ✔️ Apache Tomcat Installation, Deployment, Monitoring & Performance Tuning ✔️ CI/CD Pipelines, Jenkins Automation, Git, GitHub, Bitbucket & Version Control Systems ✔️ Web Application Troubleshooting, Production Environment Support & Incident Resolution 🧪 TESTING & QUALITY: ✔️ JUnit, Mockito, Unit Testing & Integration Testing ✔️ Test-Driven Development & Automated Testing ✔️ API Testing, Debugging & Log Analysis ✔️ Root Cause Investigation & Production Stability ✔️ Code Quality Improvements & Maintainable Software Development ✔️ Regression Testing & Application Reliability Improvements 🤖 AI-ENHANCED ENGINEERING: ✔️ AI-Assisted Development & AI-Powered Coding Workflows ✔️ OpenAI API Integration, LLM Workflows & AI Automation ✔️ AI-Assisted Testing, Refactoring & Documentation ✔️ Faster Delivery Through AI-Enhanced Engineering 🏢 INDUSTRY EXPERIENCE: ✔️ SaaS Platforms & Enterprise Applications ✔️ AdTech & Programmatic Advertising ✔️ Fintech & Loan Processing ✔️ Privacy & Compliance Systems ✔️ Digital Asset Management ✔️ Multi-Tenant & White-Label Solutions 🚀 WHY CLIENTS CHOOSE ME: ✔️ 8+ Years of Java Development Experience ✔️ Enterprise SaaS & Microservices Expertise ✔️ Strong Spring Boot & Cloud-Native Skills ✔️ Scalable, Secure & Maintainable Solutions Whether you need to build a backend platform from scratch, scale an existing SaaS application, maintain a legacy system, resolve performance bottlenecks, remediate security vulnerabilities, implement microservices, modernize enterprise software, deploy applications on Tomcat or Linux-based server systems, integrate AI capabilities, or optimize application performance, I can help. Looking for a Java Developer, Senior Java Developer, Java Backend Developer, Spring Boot Developer, Java Architect, Backend Engineer, Enterprise Software Developer, API Developer, GraphQL Developer, AWS Developer, Cloud Engineer, Kafka Developer, Software Architect, Backend Architect, or Java Consultant?

With over 10 years of hands-on experience in Java, Struts, Spring, Spring Boot, and Liferay development, I specialize in building scalable, high-performance applications across various domains. I am proficient throughout the entire development lifecycle from initial design and coding to testing and deployment, with a focus on delivering solutions that exceed client expectations. My expertise includes: • Java/J2EE and Liferay Portal Development: Designing and developing robust applications using Java-based technologies. • Frameworks & Technologies: In-depth knowledge of Struts, Spring, Spring Boot, JPA, Hibernate, and Liferay, with a strong emphasis on creating scalable, maintainable solutions. • Agile Methodology & Project Management: Extensive experience in managing end-to-end development projects, ensuring timely delivery while adhering to strict budgets and coding standards. • Team Leadership: Proven success in leading and motivating cross-functional teams to deliver high-quality applications under tight deadlines. • RESTful Services Development: Hands-on experience in creating REST APIs using Spring and Jersey. • Frontend Technologies: Proficient in jQuery, YUI3, ExtJS, HTML5, CSS3, Bootstrap, and KnockoutJS, ensuring seamless user experiences. I am known for my strong problem-solving abilities, my attention to detail, and my capacity to work effectively under pressure. Whether collaborating with clients, leading teams, or handling complex technical challenges, I am committed to delivering results that drive business success.

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.

🚀 Expert in Swift, Kotlin, Dart & React Native | Mobile App Development & Deployment 💯 100% Job Success 📱 8+ Years of Mobile App Development Experience Helping startups and businesses build modern, scalable mobile applications with AI-powered experiences, clean architecture, and enterprise-grade quality. From MVPs to large-scale mobile platforms, I combine native and cross-platform development with AI integrations to deliver secure, high-performing, and future-ready applications. 💻 Tech Expertise ✔ Cross-Platform: Flutter, Dart ✔ iOS Development: Swift, SwiftUI, UIKit, Xcode ✔ Android Development: Kotlin, Android SDK, Jetpack Compose, Java ✔ Backend & APIs: Firebase, REST APIs, GraphQL, AWS, Authentication, Payment Gateway Integration ✔ AI Integration: OpenAI, Gemini, Claude, AI Chatbots, AI Assistants, Voice AI, OCR, Speech-to-Text, Text-to-Speech ✔ Real-Time & IoT: MQTT, WebSockets, BLE, Push Notifications, Device Connectivity ✔ Databases: SQLite, CoreData, Room Database, Secure Storage ✔ Architecture: Clean Architecture, MVVM, BLoC, Cubit, Riverpod, Provider, SOLID Principles ✔ DevOps & Release: GitHub, GitHub Actions, CI/CD, App Store Connect, Google Play Console 🤖 AI-Enhanced Mobile Development ✔ AI-powered Chat & Assistant Applications ✔ OpenAI, Gemini & Claude API Integration ✔ AI-Assisted Development using Cursor, GitHub Copilot & Claude Code ✔ Smart Automation, Content Generation & Workflow Integration Leveraging AI throughout the development lifecycle helps accelerate delivery while maintaining clean code, scalable architecture, and an exceptional user experience. 🌍 Industry Experience ➺ AI & SaaS Applications ➺ FinTech & Digital Payments ➺ Healthcare & Telemedicine ➺ Logistics & Fleet Management ➺ IoT & Smart Device Applications ➺ Enterprise Mobility Solutions 💡 Why Work With Me ✔ 8+ years of professional mobile development experience ✔ Expertise in Flutter, iOS & Android development ✔ Strong focus on performance, security & scalability ✔ Clean, maintainable, production-ready code ✔ Transparent communication and Agile development ✔ Long-term technical partner for startups and enterprises 📩 Let's build intelligent, scalable, and user-friendly mobile applications together. Available to start immediately. Specialized in: Flutter Development, Mobile App Development, iOS Development, Android Development, AI Mobile Apps, OpenAI Integration, Gemini AI, Firebase, BLE, IoT Applications, MQTT, FinTech Apps, Healthcare Apps, SaaS Mobile Apps, Enterprise Mobility, MVP Development, App Modernization, Mobile Architecture, AI Chatbots, Cross-Platform Development.

Hi, I’m Priya — a Senior Backend Engineer with 10+ years of experience building scalable backend systems, cloud-native micro-services and high-performance APIs using Java and Spring Boot. Also work on Railway , Supabase, MCP Server development. Good knowledge in TypeScript/NodeJS and front-end development, I help startups and businesses: ✔ Build secure, scalable REST APIs, micro-services ✔ Third party system integration, integrated more than 400 third party systems including CRM, ERP ✔ Migrate legacy systems to modern cloud stacks ✔ Integrate AI-powered features into applications ✔ Agentic AI, RAG pipeline development, MCP Server development, integrating Claude, Open AI, Openrouter, Ollama I’ve worked with global companies like TCS, Capgemini, and Hilti, contributing to mission-critical enterprise platforms and distributed systems used at scale. Domain experience include Aesthetic/MedSpa CRM, Healthcare, Finance, Property Rental, Travel, Recruitment , Loyalty/Rewards point. 🔹 Core Expertise Java, J2EE, Spring Boot, TypeScript, Microservices (REST, event-driven, Kafka, RabbitMQ) Frontend development on Angular , React, Thymeleaf AWS (Lambda, EC2, ECS, RDS, API Gateway, S3, CloudWatch) Docker, Kubernetes, CI/CD pipelines SQL & NoSQL databases (Postgres, MySQL, MongoDB, DynamoDB, Supabase) 🤖 AI & Intelligent Systems, MCP Server, Railway I also help teams integrate modern AI capabilities into their products: Agentic AI workflows RAG (Retrieval-Augmented Generation) APIs, Configured Light RAG for uploading kowledgebase, business data and based on that AI will respond to user queries and trigger workflow. OpenAI / GPT / Claude / Gemini integrations Vector databases (pgvector, Pinecone), MultiRAG, Quadrantu56t7gy obj AI÷≥;/m microservices & knowledge-base systems Implemented MCP servers and deployed on Railway. Configured Agent in Claud and TypingCloud. If you’re looking for a senior backend engineer who can both build strong systems and think strategically about architecture, I’d be happy to discuss your project.

⭐⭐⭐⭐⭐ Delivering scalable, high-performance applications that are built to grow with your business. I am a Senior Java Full Stack Developer with 10+ years of experience building enterprise-grade backend systems, web applications, and scalable platforms across fintech, telecom, SaaS, healthcare, and operational domains. I specialize in Java, Spring Boot, Microservices, REST APIs, React.js, PostgreSQL, Kafka, and cloud-native architectures, with a strong focus on performance, maintainability, and clean system design. I have contributed to large-scale production systems for organizations such as Paytm and Airtel Africa, helping teams build reliable applications that serve thousands of users and business-critical operations. Core Expertise Backend Development • Java, Core Java • Spring Boot, Spring Framework • Hibernate, JPA , Kubernetes • REST API Development • Microservices Architecture • Kafka • WebSphere • Docker Frontend Development • React.js • Next.js • JavaScript • HTML5 • CSS3 • Tailwind CSS Databases • PostgreSQL • MySQL • MongoDB • SQLite Architecture & Integrations • Scalable System Design • API Integrations • Authentication & Authorization • Payment Gateway Integrations • Notification Systems • Third Party Service Integrations • Performance Optimization AI Assisted Development & Productivity • ChatGPT • Claude • GitHub Copilot • Cursor AI • AI Assisted Code Generation • AI Powered Debugging & Refactoring • Rapid Prototyping & Development Acceleration • AI Enhanced Documentation & Code Reviews What I Bring to Your Project ✅ Clean, maintainable, production-ready code ✅ Strong problem-solving and debugging skills ✅ Clear communication and reliable delivery ✅ Experience working in Agile development environments ✅ Effective use of AI tools to accelerate development while maintaining code quality ✅ Focus on scalability, performance, and long-term maintainability Whether you need a Spring Boot backend, React frontend, REST API development, microservices implementation, system optimization, AI assisted development, or full stack application development, I can help turn your requirements into reliable, scalable solutions. Let's discuss your project and find the best approach to achieve your goals efficiently.