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🏆 Upwork Top Rated Plus Developer 🏆 6+ years of experience in Java, Spring Boot, Kotlin, Python, Android 🏆 14,000+ Hours in Hourly Projects and more in Fixed Cost Projects 🏆 30+ Enterprise web applications deployed on cloud services 🏆 100+ Small POC applications delivered 🏆 100% Client Satisfaction & consistent best-quality delivery 🏆 Worked in FinTech, E-commerce, CRM, Cloud Integration, ETL, and Web API Integration 🏆 Self-motivated, detailed-oriented, punctual, and a fast learner 🏆 Strong troubleshooting/debugging skills 🏆 Help turn idea/concept into reality My expertise includes the following: ✔ Java Language and Frameworks: Java, Spring Boot, Spring Framework, JPA, Hibernate, Kotlin, Maven, Jetty ✔ Other Languages and Frameworks: JavaScript, Node, TypeScript, Python, Go ✔ Android SDK, React, Flutter, BT LE device integration, performance improvement ✔ SQL, NoSQL Databases: PostgreSQL, MySQL, Oracle, MongoDB, Redis ✔ IOT, AR/VR, Machine Learning ✔ REST API, GraphQL, Web Service, XML, JSON, HTML5, Reactjs, Bootstrap ✔ Cloud services like AWS, Google Cloud Platform, Azure, Heroku, Firebase ✔ Social Media Integration like Facebook, Twitter, and Linkedin ✔ Payment Gateway Stripe, Braintree, Paypal, Autorize.Net, Square ✔ Familiar with Asana, Basecamp, Git, SVN, Jira, Trello, Slack

OCJP Certified Java Architect | Spring Boot | Microservices | AWS | Kafka | Camunda | 13+ Years Experience With 13+ years of professional experience in designing, developing, and deploying enterprise-grade applications, I help businesses build scalable, secure, and high-performance cloud-native solutions. My expertise spans Java, Spring Boot, Microservices Architecture, AWS Cloud, Kafka, Redis, Docker, Kubernetes, CI/CD, OAuth2, Keycloak, JWT, and Camunda BPM. Key Highlights: ✔ OCJP Certified Java Professional ✔ 12+ Years of Software Development Experience ✔ Microservices & Cloud-Native Architecture Specialist ✔ Banking & FinTech Domain Expertise ✔ RESTful APIs, Event-Driven Systems, and Distributed Architecture ✔ AWS Cloud Deployment & DevOps Automation ✔ Security Implementation with OAuth2, JWT, Keycloak, LDAP, and Okta Recent Accomplishments: ✅ Designed and implemented cloud-native microservices using Java, Spring Boot, Spring Cloud, Docker, and Kubernetes. ✅ Built FinTech and Banking solutions integrating payment gateways and remittance platforms, including Stripe, RIA, and Instant Cash Exchange House APIs. ✅ Developed high-performance event-driven architectures using Kafka and Redis for real-time processing and scalability. ✅ Automated deployment pipelines using Jenkins, Docker, Kubernetes, SonarQube, and Git-based CI/CD workflows. ✅ Implemented workflow orchestration and business process automation using Camunda BPM. AI-Assisted Development: I effectively leverage AI tools such as ChatGPT and GitHub Copilot to accelerate development productivity by 60–80% through: • Business rule analysis and API design • Schema and ORM modeling • Rapid endpoint generation • Code completion and refactoring • Automated code reviews and quality improvements • Technical documentation generation Core Technologies: • Java, Spring Boot, Spring Framework, Spring Cloud, Hibernate, JPA, Camunda, GraphQL, WebSockets • Kafka, RabbitMQ, Redis, Docker, Kubernetes • MySQL, Oracle, PostgreSQL, MongoDB, Elasticsearch • AWS (EC2, ECS, RDS, S3, IAM, SQS) • OAuth2, JWT, Keycloak, LDAP, Okta, Spring Security • React, Angular, TypeScript, JavaScript • Jenkins, Git, Maven, SonarQube, Jira I am passionate about building reliable, scalable, and secure enterprise solutions that deliver measurable business value. Let's discuss how I can help your team accelerate development, modernize architecture, and successfully deliver high-quality software solutions.

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

Hi, I'm Mohammad Rajaul Islam. I am a Senior Java Spring Boot Developer, Software Architect, and Tech Lead with over 16 years of software development experience, including more than 12 years specializing in enterprise Java development. I help businesses build, modernize, migrate, and scale secure, cloud-native enterprise applications using modern Java technologies and distributed system architecture. WHY CLIENTS HIRE ME ✓ 16+ Years Software Development Experience ✓ 12+ Years Enterprise Java Experience ✓ 164 Successfully Completed Projects ✓ 100% Job Success ✓ 1,200+ Hours Worked on Upwork ✓ Oracle Certified Professional (OCP), Java Programmer ✓ Certified Scrum Master ✓ Senior Software Engineer at a Japanese Technology Company Throughout my career, I have worked with startups, enterprises, government organizations, banks, healthcare providers, travel technology companies, and educational institutions, delivering production-ready software that is secure, scalable, maintainable, and built for long-term growth. WHAT I CAN HELP YOU BUILD • Enterprise Java Applications • Spring Boot & Spring Cloud Applications • REST APIs & Backend Systems • Microservices & Distributed Systems • Software Architecture & System Design • Legacy System Modernization • Node.js / TypeScript to Java Spring Boot Migration • Cloud-Native Applications • AWS Deployment • Docker & Kubernetes • Performance Optimization • Elasticsearch & Enterprise Search • PostgreSQL, MySQL & Redis • Kafka & Event-Driven Architecture • Technical Leadership & Team Mentoring ENTERPRISE SECURITY One of my strongest areas is designing secure enterprise applications. I have hands-on experience designing and implementing secure systems using: • Spring Security • OAuth2 • OpenID Connect (OIDC) • Keycloak • JWT • Mutual TLS (mTLS) • Role-Based Access Control (RBAC) • Secure API Design • Zero Trust Architecture My goal is not only to develop software but to ensure it remains secure, reliable, and maintainable throughout its lifecycle. FULL-STACK TECHNOLOGIES In addition to Java, I also have professional experience with: • React • Next.js • Angular • JavaScript • TypeScript • Python • Django • PHP • Laravel • Android (Java) This enables me to understand complete systems and collaborate effectively across frontend, backend, and infrastructure teams. CLOUD & DEVOPS • AWS • Docker • Kubernetes • GitHub Actions • Jenkins • CI/CD • Splunk • Distributed Logging & Monitoring • Linux ADDITIONAL EXPERIENCE • IoT Solutions • MQTT Messaging • UAV (Drone) Projects • Biometric Device Integration • GPS & Location Services • AI-Assisted Development • Healthcare Systems • Banking & FinTech • Government Digital Transformation LEADERSHIP EXPERIENCE Beyond software development, I have served as a: • Software Architect • Tech Lead • Project Manager • Scrum Master • Enterprise Consultant • Engineering Mentor I understand the complete software development lifecycle—from architecture and estimation to implementation, deployment, production support, mentoring, and continuous improvement. I enjoy solving complex engineering challenges, communicating clearly with clients, and building long-term partnerships based on trust, quality, and consistent delivery. If you're looking for someone who can contribute beyond coding and help build a secure, scalable, production-ready system, I'd be happy to discuss your project. Let's build something great together.

13+ years experienced in Java/J2EE | AWS Certified(SAA , DVA, CloudOps) | Java Professional Certified | Docker | Kubernetes | Rest API | OPENAPI| Spring boot| JPA | Oracle | Mysql | Process Mining | AI | Langchain | Langgraph | RAG | MCP | OpenAI | React Js| ZK | EJB Certified | 7 years in Financial or Banking application | Agile/Scrum | Lead Team.

Hi there! I'm a Computer Science graduate with over 9 years of hands-on experience building software that actually works — cleanly written, well-tested, and delivered on time. I've worked with clients across Upwork and Elance on a wide range of projects, from web applications and backend systems to mobile apps and database-driven solutions. Whether you need a full product built from scratch or a tricky bug squashed, I bring the same level of care and attention to every task. A few things that set me apart: * I'm a competitive programmer — I've solved 420+ problems on UVA Online Judge and participated in ICPC contests (2012, 2013, 2014). This means I don't just write code; I think through problems carefully before I write a single line. * I'm available 24/7 and communicate clearly throughout a project, so you're never left wondering where things stand. * Every project comes with 14 days of free post-delivery support, because I care about the outcome, not just the handoff. What I can help you with: *Backend & API development (Java, Spring Boot, Spring Webflux) *Web design & development (HTML, CSS, JavaScript, JSP) *Android app development *Database design & management (MySQL, Oracle, SQLite) *Reporting & templates (Jasper iReport) *Bug fixing, code review, and optimization I take pride in writing clean, maintainable code and keeping my clients in the loop every step of the way. If you have a project in mind — big or small — I'd love to hear about it. Let's build something great together.