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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.

Hello! I've been a Software Engineer and Developer for more than five years. I create fast, secure, and user-friendly custom websites and web apps. I am very passionate about software engineering. I believe logic is more important than knowing a specific language. I am fully synced and experienced in PHP Laravel, Java Spring Boot, DotNet/ .Net (C#) for backend and React, NextJs, Angular , Vuejs, for frontend and I am open to explore any other technology at your need. I make sure that everything functions properly on all devices and always write clean code. I can assist you with bug fixing and deployments and automations. I have recently participated in beta testing for pre-launched app. 💻 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 ⭐𝐁𝐚𝐜𝐤𝐞𝐧𝐝: 𝖫𝖺𝗋𝖺𝗏𝖾𝗅, .Net, Java Springboot ⭐𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: 𝖩𝖺𝗏𝖺𝖲𝖼𝗋𝗂𝗉𝗍, 𝖳𝗒𝗉𝖾𝖲𝖼𝗋𝗂𝗉𝗍, 𝖧𝖳𝖬𝖫𝟧, 𝖢𝖲𝖲/𝖲𝖠𝖲𝖲, Tailwind, Vue.js, Nextjs, Angular, React ⭐𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: 𝖬𝗒𝖲𝖰𝖫, 𝖯𝗈𝗌𝗍𝗀𝗋𝖾𝖲𝖰𝖫, Oracle PLSql, 𝖬𝗈𝗇𝗀𝗈𝖣𝖡, 𝖥𝗂𝗋𝖾𝖻𝖺𝗌𝖾 ⭐𝐀𝐏𝐈𝐬: 𝖱𝖤𝖲𝖳𝖿𝗎𝗅 ⭐𝐃𝐞𝐯𝐎𝐩𝐬: 𝖠𝖶𝖲, Azure, 𝖥𝗂𝗋𝖾𝖻𝖺𝗌𝖾, 𝖵𝖾𝗋𝖼𝖾𝗅 ⭐𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐓𝐨𝐨𝐥𝐬: 𝖦𝗂𝗍𝖧𝗎𝖻, 𝖦𝗂𝗍𝖫𝖺𝖡, 𝖡𝗂𝗍𝖻𝗎𝖼𝗄𝖾𝗍, 𝖵𝖲 𝖢𝗈𝖽𝖾, Visual Studio, IntelliJ ⭐𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐌𝐚𝐧𝐚𝐠𝐞𝐦𝐞𝐧𝐭: 𝖩𝖨𝖱𝖠, Slack ⭐𝐔𝐈/𝐔𝐗: 𝖥𝗂𝗀𝗆𝖺, Axure Prototype, Miro ⭐𝐒𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐞𝐝 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬 ⭐𝐏𝐚𝐲𝐦𝐞𝐧𝐭 𝐆𝐚𝐭𝐞𝐰𝐚𝐲𝐬: 𝖲𝗍𝗋𝗂𝗉𝖾, 𝖱𝖺𝗓𝗈𝗋𝖯𝖺𝗒, Square, 𝖠𝗉𝗉𝗅𝖾 𝖯𝖺𝗒, Bkash, Sslcommerz, Worldline-solutions, Cards ⭐𝐂𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐢𝐨𝐧 𝐀𝐏𝐈𝐬: 𝖳𝗐𝗂𝗅𝗂𝗈, 𝖲𝖾𝗇𝖽𝖦𝗋𝗂𝖽, Aws WebSocket Services, Pusherjs 🌟 Laravel & Full Stack Services Include: ✅ Custom Laravel Web Development ✅ RESTful API & Third-Party Integration (Stripe, PayPal, Twilio, SendGrid) ✅ Full Stack App Development (Laravel + Vue.js / React.js) (SpringBoot/.Net + React/Nextjs/Angular) ✅ SaaS Platform Development ✅ Admin Dashboard, CRM, and CMS ✅ E-commerce Store Development ✅ Website Speed Optimization & Performance Tuning ✅ Database Design (MySQL, MS Sql, PostGreSql, Oracle PL-Sql, MongoDB, Firebase) ✅ Version Control (Git, GitHub, Bitbucket) ✅ Server Setup (AWS, Azure, Hostinger, GoDaddy,, cPanel) 🌟 Why Clients Hire Me 🔒 Clean, secure, and well-documented code 🚀 Fast delivery without compromising quality 📈 Scalable architecture for future growth 🧠 Proactive problem-solver and good communicator 🤝 Long-term collaboration mindset

Hi, I'm Md. Atiqur Rahman, a Full-Stack Developer & Deployment Engineer with 4+ years of experience building scalable RESTful APIs, full-stack web applications, and deploying production-ready systems across modern cloud and traditional hosting environments. Whether you need a robust backend API, a dynamic frontend, or a seamless server deployment — I handle it all under one roof. 🔧 Backend & API Development ✅ Laravel REST API, Livewire & Blade Development ✅ PHP, Symfony & WordPress Backend Engineering ✅ Java (Spring Boot) Microservices ✅ Python and FastAPI ✅ Database Design, Architecture & Query Optimization (MySQL, MongoDB) ✅ Payment Integrations — Stripe, PayPal, SSLCOMMERZ, QuickBooks ✅Third-Party API Integration — Google, Facebook, Twilio, Slack SMS, Mail & more ✅ RAG, Agent, Fine-tuning, LLM, DL, Prompt & Context Engineering, OpenAI, Cursor, Claude, Agentic AI, n8n, OpenClaw 🖥️ Frontend Development ✅ Vue.js, Nuxt.js, Quasar (Web & Mobile) ✅ Bootstrap, Tailwind CSS — Responsive & Modern UI ✅ Frontend–Backend API Integration 🚀 Deployment & Server Management ✅ End-to-End App Deployment — Laravel, WordPress, Symfony ✅ VPS, cPanel & Shared Hosting Setup & Configuration ✅ AWS & DigitalOcean Server Provisioning ✅ Server Security Hardening & Performance Optimization ✅ Domain Setup, DNS Configuration & SSL Installation ✅ Database Migration, Backup & Recovery ✅ Git, GitHub, GitLab & CI/CD Pipeline Integration ✅ Fixing Broken Deployments & Migration Issues 💡 Why Clients Choose Me: 🎯 One developer for full-stack development and deployment — no handoff gaps ⏱️ On-time delivery with clean, well-structured source code 📡 GMT+6 timezone — responsive, reliable & easy to communicate with ⚡ Fast learner, adaptable to your existing stack and workflows From building your API from scratch to deploying it securely on a production server — I deliver complete, end-to-end solutions that just work. 📩 Ready to start? Click "Invite" and let's build something great together!

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

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.

🏅 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!