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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

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!

Need a backend, full-stack, or AI system that holds up in production, not just on a demo branch? That's what I do. I'm a senior software engineer with 6+ years building web apps, desktop products, data platforms, and enterprise integrations for clients in the US, Canada, and Europe. Clients usually come to me with one of these problems: - "Our API is slow or falls over under load." I profile it, fix the queries and caching, and add retries, idempotency, and monitoring so failures stop reaching your users. - "We need a real product, not a prototype." Secure auth, roles and permissions, billing, background jobs, licensing, automated tests, and CI/CD are part of the build, not a phase two. - "We want AI over our own documents but it keeps answering wrong." I build RAG pipelines with hybrid search, reranking, and measured retrieval quality so answers are traceable. - "Our legacy mainframe code needs to run somewhere modern." I deploy and repair COBOL/CICS/DB2/JCL systems on z/OS and IBM Cloud. WHAT I WORK WITH Backend: .NET Core, Python, FastAPI, Node.js, REST APIs, Clean Architecture, CQRS, Kafka, MassTransit, SignalR, Hangfire Frontend: Angular, React, Next.js, TypeScript, RxJS, NgRx, Tailwind, Material UI Data: PostgreSQL, SQL Server, MongoDB, Redis, Qdrant, pgvector AI: RAG, LangChain, OpenAI, Cohere, hybrid vector + BM25 search, reranking, evaluation Cloud and DevOps: AWS, Azure, IBM Cloud, Docker, GitHub Actions, Azure DevOps, xUnit, pytest Mainframe: z/OS, COBOL, CICS, DB2, VSAM, JCL WHAT I'VE DELIVERED - A multi-tenant vendor risk platform covering supplier onboarding through audits and remediation, with enterprise SSO, granular permissions, Stripe billing, and AWS deployment. - Three years on a freight-forwarding ERP: 1,000+ endpoints, 25+ carrier and accounting integrations, and the full rate-to-shipment lifecycle. - A licensed Windows and macOS desktop product with signed entitlements, offline grace periods, and crash-recovery testing. - A multilingual vehicle-manual chatbot with intent classification and an automated retrieval-evaluation harness. - Technical leadership of a 6-developer team across architecture, estimation, and releases. HOW I WORK I plan carefully before writing code, clarify anything that is unclear, and provide an honest estimate before development begins. I will also tell you early if an approach is risky or unlikely to work. You will receive working increments that you can review throughout the project - not a month of silence followed by unexpected results. I always take ownership of project and meet the deadline I commit to. I have maintained a 100% Job Success Score and delivered more than 2,400 hours of work on Upwork. Some of my project details are in my portfolio and work history below. Send me your requirements, and I will reply with a clear technical approach, the main trade-offs, and a realistic delivery timeline.

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

🏆 Top Rated Freelancer (Top 10% on Upwork) Full-stack engineer with 10+ years of experience, now focused on DevOps automation, observability, and AI-driven systems. I build scalable platforms that not only run—but monitor, diagnose, and fix themselves. 🔧 Expertise Frontend & Backend: React, Node.js, Vue.js, FastAPI, Django, Laravel AI Automation: Agent-based log analysis & auto-remediation systems Observability: OpenTelemetry (logs, metrics, traces) Distributed Systems: Kafka/NATS, RabbitMQ Databases: PostgreSQL, MongoDB, Prisma Cloud & DevOps: AWS, CI/CD, containerized deployments 🚀 Selected Work Self-Healing Infrastructure Platform End-to-end pipeline: Logs → AI Analysis → Fix → Auto PR AI Log Analyzer Agent (mitbar-web) Console + browser agent for real-time issue detection & fixes Real-Time Monitoring Dashboard Unified logs/metrics/traces with live system control Event-Driven Automation System Alert → AI diagnosis → automated action pipeline 🔗 References NPM package: mitbar-web Git automation via Octokit Demos/code available on request