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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

I am a Senior Software & Database Consultant with 15+ years of experience in designing, building, and maintaining scalable, high-availability enterprise systems. I started my career as a Software Developer and System Designer (C#, ASP.NETCore, Java, Oracle, SQL Server, NoSQL), later served as a Team Leader / Software Architect, and for the last 7 years have been working as a Software & Database Consultant delivering end-to-end solutions. I specialize in software architecture, database clustering, performance tuning, migrations, and DevOps automation, ensuring secure, reliable, and production-ready systems. Core Expertise • End-to-end software design & development • High-availability database architecture & clustering • Database migration, backup & disaster recovery • Linux-based database administration & monitoring • DevOps, CI/CD & deployment automation. Technologies: Backend: C#, ASP.NETCore , Java (Spring Boot), PHP (Laravel), Node.js, Python Databases: Oracle, SQL Server, PostgreSQL, MySQL, Elasticsearch, Redis, MinIO, Kudu. DevOps: Ansible, Docker, Kubernetes, Jenkins, Prometheus, Grafana, Kafka Frontend: React, Angular, HTML5, CSS3, JavaScript. What I Deliver (With Results) • End-to-end software development delivery — from requirement analysis and system design to development, testing, deployment, and production support • 99.9%+ system uptime through database clustering and high-availability architecture • 30–60% performance improvement via application optimization, efficient code design, query tuning, and indexing strategies • Zero-data-loss database migrations for Oracle, SQL Server, and PostgreSQL, Elasticsearch, MongoDB, MinIO. • Faster release cycles (up to 70%) through CI/CD automation and streamlined deployment pipelines • Reduced operational costs through containerization, infrastructure optimization, and automation

Hi! I’m Md. Saddam Hossen, a results-oriented Full Stack Developer with 5+ years of experience building scalable, secure, and high-performance web applications. I specialize in Java Spring Boot, React, Angular, and cloud deployment using AWS and Docker. I’ve developed and deployed multiple full-stack systems and enterprise applications, optimized for performance, reliability, and maintainability. My work consistently reduces latency, improves database efficiency, enhances UX using modern UI frameworks, and ensures quality with thorough QA and testing practices. 🚀 What I Offer: ✅ Full Stack Web App Development (React/Angular + Spring Boot) ✅ Backend Microservices with REST APIs (Java, Spring Boot, Kafka, Redis, RabbitMQ) ✅ Frontend SPAs with React, Angular, Bootstrap, Tailwind CSS ✅ Cloud Deployment on AWS EC2, Digital Ocean using Docker & Kubernetes ✅ CI/CD Pipelines with Jenkins & GitLab CI/CD ✅ Secure Auth with JWT & Role-Based Access Control ✅ PostgreSQL, MongoDB, MySQL – Design, Optimization, Query Tuning ✅ QA & Testing – JUnit, Postman, Manual Testing, Debugging 🏗️ Projects I've Built: ✅ Device Management System – Inventory, Warranty & Service Tracking ✅ Attendance Tracker – Role-based dashboard with JWT-secured REST APIs ✅ Training Platform – Admin/Student Modules, Feedback System 🔗 Live apps & source code in portfolio below. 🛠️ Tech Stack: Java, Spring Boot, React.js, Angular, MongoDB, MySQL, PostgreSQL, Docker, AWS, Jenkins, Kafka, RabbitMQ, Redis, GitLab CI/CD, WebSockets, Thymeleaf, Tailwind CSS, JUnit, Postman 🎓 Education & Certifications: ✅ BSc in Computer Science & Engineering, MBSTU (2023) ✅ AWS Cloud Practitioner (In Progress) ✅ Responsive Web Design – freeCodeCamp Let’s build something scalable and modern! I’m here to help you turn ideas into working products with clean code, secure architecture, and real business value. 📬 Message me today to get started!

I'm a Senior Full Stack Developer with 12+ years of professional experience building scalable web applications, secure REST APIs, and enterprise-grade systems across the RMG (garments), legal tech, and SaaS industries. My core stack: ▸ Backend: ASP.NET Core, C#, Clean Architecture, CQRS/MediatR, gRPC, SignalR ▸ Frontend: React, Next.js, Vue.js (latest) ▸ Databases: PostgreSQL, SQL Server, Redis ▸ Auth: JWT, IdentityServer4, OAuth2 ▸ Messaging: RabbitMQ, MassTransit, Outbox Pattern ▸ API Gateway: YARP, Ocelot ▸ Cloud & DevOps: GCP (Cloud Run, GKE Autopilot), Azure DevOps, CI/CD pipelines ▸ Containers: Docker, Docker Compose, Kubernetes What I've built in production: ▸ Multi-tenant SaaS ERP platforms with microservices architecture serving 100+ concurrent users ▸ Secure REST API layers with token-based authentication and role-based authorisation ▸ Travel Agency ERP with CRM, Booking, Visa, and Itinerary microservices (ongoing) ▸ IoT digital transformation systems for large-scale garments factories (ESP32, MQTT, FreeRTOS) ▸ AI-integrated systems using RAG, LLaMA3, TensorFlow, and OpenCV ▸ GCP infrastructure design for multi-tenant school management SaaS (15 microservices, YARP gateway) Why clients work with me: ▸ I don't just write code — I understand the business problem first ▸ Clean, maintainable code with proper documentation ▸ Proactive communication and on-time delivery ▸ I contribute to architectural decisions, not just assigned tasks ▸ Comfortable working in English-only environments across time zones If you need a developer who brings both deep technical skill and real-world delivery experience to your project — let's talk.

🏅 Certified Professional: Python (PCEP, PCAP) & Java (OCA) 🏆 Proven Experience: Expert in business automation solutions 💰 Results-Oriented: Focused on delivering measurable business value Skills & Expertise: • Programming Languages: Python, Java, PHP • JavaScript : React, Vue, Angular, TypeScript, jQuery • Backend Development: Django, Spring Boot, Laravel, CodeIgniter, Custom PHP • Database Management: MySQL, MSSQL, PostgreSQL, Oracle, MongoDB • Web Development: HTML, CSS, Bootstrap, Thymeleaf, Blade Templates • API Integration: JSON, XML, REST, SOAP • Reporting Tools: JasperReports • Infrastructure & Cloud: HAProxy, Spring Cloud Gateway, Microservices, Google Cloud, Azure, Docker, Kubernetes 🌟If you're seeking a dependable partner to elevate your project, let's connect and explore how I can contribute to your success. Feel free to reach out or schedule a chat!