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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?

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.

I am a qualified Software Engineer and have more than 12+ years of experience in Software Development. From Rest API to AI (Watson) to Cloudant and MongoDB with Replica, I have developed many cross-platform applications from scratch to implementation. What I can do for you: → Desktop and Web Application Development → Rest API using Spring Framework → Android Application → Angular Application → Ionic Application for Android and iOS → React Native Application → AWS EC2 Setup, AWS CodeBuild, AWS CodeDeploy, AWS CI/CD pipeline → Azure CI/CD pipeline → IBM Watson Integration - NLU, Language Translator, Speech to Text, Text to Speech → Payment Gateway Integration - PayPal, Stripe Skills: → Java, SpringBoot, Hibernate, JavaFX, Spring Cloud → Angular, Ionic, React Native, ReactJS, Typescript → MongoDB, MySql, Firebase, postgresql → Maven, Gradle → Android → git → RESTful Web Services For the last one and half years, I have been developing and implementing a web portal involving Online ordering, product catalog, inventory, accounts, CRM, customized order, POS, Scheduling, Billing, Booking, customized ordering, stocks, Admin Panel. Using Java, Node JS, React Native, Angular JS, FCM, Stripe, PayPal, etc. Apart from this, my significant achievement is the API development of CogAbility and CogUniversity involving IBM Watson using AI and Machine Learning. I am looking for opportunities to develop or enhance applications, online portals. In addition, I am also available to provide support and enhancement in existing and ongoing projects.

Hi, I am a Backend Engineer with 5+ years of experience building scalable, secure, and high-performance applications using Java, Spring Boot, and microservices architecture. I have extensive experience with developing RESTful APIs, implementing secure authentication and authorization using Spring Security, and working with J2EE-based systems. I follow a Test-Driven Development (TDD) approach using tools such as JUnit, Mockito, and Spring Boot Test to ensure high code quality and reliability. Also I have worked extensively with SQL databases including MySQL and PostgreSQL, focusing on performance, scalability, and clean data design. Beyond development, I also have strong experience in cloud and DevOps, working with Google Cloud Platform and AWS. I have experience with building and deploying containerized applications using Docker and Kubernetes, and I use Terraform and Infrastructure as Code (IaC) to automate deployments and manage cloud infrastructure efficiently. I understand the full lifecycle of an application — from development to deployment and scaling. Apart from that I have also worked on desktop applications using JavaFX and Swing. I bring with myself Ownership taking and Problem solving capabilities. I also have excellent communication skills (both verbal and written) and keep my communication up to date while working on the project. I work on delivering solutions that are scalable, secure, and aligned with business goals. Also I am flexible with my working hours to ensure smooth collaboration and timely delivery of the project. If my profile aligns with your requirement, I'd be happy to connect and discuss your project in detail. Best Regards, Gursewak

An accomplished IT professional with 20+ years of experience in design, development, maintenance, and transition of the web, multitier and legacy applications in the global delivery model for various domains includes Trading,Insurance, Manufacturing, and Banking. Involved in all phases of the software project life cycle coupled with the ability to handle the critical technical aspects of the project. Specialized in Web, Mobile,Desktop and AS400/iSeries - Application development and maintenance. Excellent knowledge & expertise in Web, JEE and .NET application and product development Technical skills summary: Operating Systems : MS-DOS , Windows, HP-UX, Netware , Linux, OS/400 Languages & GUI RAD : Visual Studio, Websphere Studio, Netbeans, Visual Age Java, C, C++, Clipper,VB Java : Spring,Struts,AWT, SWING, NET,RMI, JSP, Servlet, JDBC, EJB, JMS, JMAPI, JNDI, Struts Hibernate, JToolBox DBMS & RDBMS : DB2/400,Oracle 8i, SQL Server 7, MS-ACCESS, MySql, Foxpro AS/400 : CL/400, DB2/400, RPG/400, COBOL, ILE RPG, ILE COBOL, Java/400, SQL/400 Web/App Servers : Websphere, Weblogic, IIS, JRun, Apache, Tomcat Web Technologies : Jquery,Bootstrap, CSS, HTML5, NodeJS,React,.NET, JavaScript, Activex, COM+, HTML, XML, Web Services Tools : ALDON, ROBOT, COLD, BRODERICK, Rational Products, JIRA, REMEDY, ServiceNow Mobile: Android studio, React Native Tool Name Description Technology Impact Analyzer A full-fledged product to do Impact Analysis of Dependent objects. AS/400 (ILE RPG, ILE CL) Code Generator Tool for generating the high-level language of source code. AS/400 (ILE RPG, ILE CL) Data Tools A set of utilities performs data manipulation. AS/400 (ILE RPG, ILE CL) EPSMON A production monitoring System on AS/400. AS/400(ILE RPG, ILE CL) EzTest Complete web based Automated Testing Software for AS/400 and Mainframe J2EE(Struts,Springboot, Quarkus, Javlin,Hibernate),DB2/400, JToolBox, ILE RPG & ILE CL, MYSQL, Netbeans, JDerby VDMT Workflow/Dataload tool for Velocity Java, Webservices VLC Extension Framework used to build custom component for Velocity Application Java, SFTP, Socket, Swing, scripting  An effective communicator with strong analytical and problem-solving skills.  Very good in Project / Program Management including delivery and client relationship management  Possesses excellent leadership skills in executing managed services project adhering to SLA norms  In depth experience in software design, development, architecture and project management experience in Applications running in Windows, Oracle and J2EE, IBM AS/400, HP-UNIX and Linux platforms  Strong project management experience and delivered various business critical projects within schedule and cost  Proficient in designing & implementation of Middleware technologies, Custom Application Servers and Business Component Servers  Excellent experience in Legacy modernization and Tools Development on iSeries and Java platform.  Excellent knowledge and experience in managing application knowledge transition using structured techniques  Good understanding and experience in different aspects of ITIL , project management principles including scope, effort, schedule, resources, risk, quality and communication  Good exposure to preparation and presentation of governance reports to senior leadership  Good experience in driving efficiency gains and innovations in sourcing engagements  Coordinated with diverse workgroups such as Business, Infrastructure, Database, Development & Testing teams Specialized areas: AI Programming, Zugferd, mustang, Jasper, JT400, Teams API, PDF processing, Web application, Springboot, Foxpro/DBF migration, iSeries migration and Integration, Web Services and REST API implementation

⭐⭐⭐⭐⭐ 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.