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Java | Spring Boot | Backend 2+ Years of Experience Hello! I'm Joy Islam, a Java Developer with over 2 years of experience building scalable, high-performance systems across web, and cloud platforms. I specialize in Java/Spring Boot backend architecture, and Restful API-first integrations—with production experience on Tomcat and hybrid infrastructures. My work spans eCommerce middleware, enterprise APIs, and mobile-first apps. 🔍 Core Expertise 💻 Backend / Middleware Java (8, 11, 17) — Lambdas, Streams, Functional Interfaces Spring Ecosystem — Boot, Batch, Cloud, Data, Security Java EE / Jakarta EE — JPA, Hibernate, Servlets, EJB API Integrations — Bloomberg, QuoteMedia, TWS(Trading Work Station), custom REST/SOAP Message Brokers — Kafka Built apps with push notifications, emails, REST APIs Published to Google Play and App Store with CI/CD CI/CD pipelines: GitHub Actions Version control: GitHub, VisualSVN 🗃️ Databases SQL: PostgreSQL, MySQL 🧪 Testing JUnit, Mockito, Integration Testing, Spring Test 🛠️ How I Work ✔ End-to-end SDLC — from requirements to deployment ✔ Agile/Scrum experience — sprint planning, retrospectives ✔ Strong in architecture, refactoring, testing, and secure design ✔ Transparent communication, fast turnarounds, and clean, maintainable code Let’s bring your vision to life with clean code and cloud-native architecture.

I am a passionate programmer. I'm an expert Java Full stack developer with 10+ years of professional experience and focused on OOP technologies. I have an extensive background in large-scale web based systems. Expertise in full Software Development Life Cycle (SDLC) including Software Architecture, Object Oriented programming, Data structure & Algorithm, Database Design, J2EE Security, Encryption, Javascript. Worked on various E-commerce sites, Banking domain. My Skill set: Backend: --JAVASE(JavaSwing,JavaFx) -- Java EE (JSP, JSF, Servlet, EJB, JMS, JDBC, JPA etc) -- Spring (MVC, IoC, security,Cloud, boot, data, and transaction) -- Hibernate -- Web services (REST/SOAP) Frontend: -- HTML5, Javascript, Jquery, DHTMLX -- ExtJs -- JQXGrid -- Angular 4 -- Angular 4 upper Databases: -- MySQL, DB2, SQL Server, Oracle -- MongoDB Build tools: -- Maven Version Controls: -- Git, SVN Reporting Tools: -- Itext, Apache POI,Swagger,Jasper Cloud: -- Amazon AWS (EC2, S3) Servers: -- Tomcat -- Wildfly Code Generator -- Jhipster Other Technologies -- Hazelcast -- Aerospike -- Solr -- Lucene -- Artemis(Active MQ) -- LDAP I have worked in team size from 10 to 20 developers so far. To establish further healthy relationship allow me to provide satisfying work with meeting your expectations successfully and has the potential to maintain a long term relationship. Clear code with suitable commenting. Good communication to fulfill your requirements.I am sure I can help you building effective solutions for your business and provide the best quality support of them.

Java & Spring Boot Architect | AI-Powered Backend Systems | 14+ Years Experience I am a Java & Spring Boot architect with 14+ years of hands-on experience building production-grade enterprise systems — from core banking platforms to AI-integrated microservices. I hold a BSc in Computer Science & Technology and now work as a dedicated full-time freelancer on Upwork, bringing the same rigour I applied in large fintech institutions directly to client projects. My core expertise spans Spring Boot, Spring Framework, and microservices architecture, with deep practical knowledge of SSO & Keycloak, Docker, DevOps pipelines, and GitLab CI/CD. I design systems that are secure, observable, and built to scale — whether that means integrating Kafka for event-driven flows, Flowable BPMN for workflow automation, or AWS for cloud infrastructure. Over the past year I have been heavily invested in the AI/LLM frontier: building Spring AI applications, wiring up MCP (Model Context Protocol) servers, running local models via Ollama, and implementing advanced patterns like tool calling, RAG pipelines, and AI agent workflows. I see AI not as a separate layer but as a first-class citizen inside enterprise Java backends. If you need someone who understands both the old-school reliability of enterprise Java and the new possibilities of AI-augmented architecture — let's talk. CORE STACK: Java · Spring Boot · Spring Framework · Microservices · REST API · Keycloak/SSO · Docker · GitLab CI/CD · DevOps · Kafka · Flowable BPMN · Oracle · PostgreSQL · AWS · Angular AI & EMERGING TECH: Spring AI · MCP · Ollama · Tool Calling · AI Agents · RAG Pipelines · pgvector · LLM Integration · OpenAI API · Prompt Engineering DOMAINS: Banking & Fintech · SWIFT/ISO 8583 · AML/CFT Compliance · NPSB/RTGS · ATM Switch · eKYC · Healthcare/EMR · Document Management

Experienced in Spring Boot, Core Java, thymeleaf Engineer with devops task offered having 8+ years of experience. I have previously launched many sized Spring Projects that push innovation forward, helping people and businesses growth. I do also work on Back-End, Front-End and readiness of whole Database system. Java, Spring Boot, AWS Cloud, Spring Data, Hibernate, JPA, Spring Security, Spring MVC, Microservice, Java Server Page, iReport, JasperStudio, JasperReports, Apache POI, Log4js, Thymeleaf, Maven, REST API, Lambda AWS - Manage EC2, Amazon RDS, AWS Lambda, AWS Deployment Platform - Windows (8,10,11), Ubuntu, Mac OS Database - MySQL, PostgreSQL, Oracle Server - Nginx, Tomcat, Serverless Lambda Other - Git, Maven, JavaScript, jQuery, BootStrap, Jira, BitBucket Why choose me: • Affordable price • 100% client's satisfaction • The highest quality of work • Best communication with clients • Flexible time for client I will ensure my enthusiasm for your project to make it a great success and deliver work within deadline providing extra effort.

With more than 12 years of experience, I’ve engineered systems from scratch, rebuilt architectures, scaled complex infrastructures, and delivered mission-critical solutions for organizations. I specialize in designing and developing clean, reliable, and maintainable software, with a strong focus on solving complex technical challenges efficiently and effectively.

I am a Senior Front End Developer with Javascript (React.js, Sevelte, Node.js), Java (Springboot) developer with a M.Sc. in Information Technology from University of Stuttgart, Stuttgart, Germany and 5 years of software development experience. I am experienced in Javascript (React.js, Svelte, Node.js), Java EE (springboot) framework technologies. I have a working experience with React.js, Svelte for front-end and Java-Springboot for back-end api development. I have also designed and developed web user controls, user security, master pages, validation control, authorisation and authentication control, CSS files using technologies like AJAX toolkit, JQuery, JavaScript, XML, HTML, JSON and HTML5. When working on a new project, I like to speak with my clients so that I can have a clear understanding of their needs and vision of the project. Thank you in advance for your time and consideration. I look forward to working with you soon.