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With 10+ years of experience as a Senior Engineer and Technical Team Lead, I specialize in driving large-scale enterprise applications through Agile best practices. I provide a strong ownership mentality and clear communication, having successfully led 10+ enterprise projects from initial development to production handover and client delivery. My expertise covers .NET, React, Blazor, Rust, and Python using Microservices and Clean Architecture with Postgres and MongoDB. I manage Azure and AWS cloud environments daily, integrating advanced AI via LangChain and Semantic Kernel alongside complex APIs like Salesforce, QuickBooks, Xero, and Microsoft Graph. ✔️ Industry Experience Banking | Fintech | Audit | Workflow Automation | Accounting and Tax Related App | Custom Business Solution | CRM | Lead Management | Business Web App ✔️Programming Languages C# (.NET 8/9) | Rust | Python | TypeScript | JavaScript | C++ | SQL ✔️Backend Technologies & Frameworks ASP.NET Core (Web API & Microservices) | Actix | Rocket | ExpressJS | NextJS | .NET Framework | WinForms | FastAPI | Django | CLI Tools Development ✔️Frontend Technologies & Framework React | Next.js | Blazor (WASM & Server) | Angular | jQuery | Bootstrap | Tailwind CSS | Figma to Code ✔️Cloud & Managed Servers Azure | AWS | Windows Server | Linux Server | Docker | Kubernetes (K8s) | Helm | Containerization ✔️CI/CD & DevOps Automation Azure DevOps | GitHub Actions | GitHub CI | Jenkins | Terraform (IaC) | GitOps | Infrastructure as Code | Release Management ✔️Cloud Services Azure App Service | Azure Blob Storage | Azure Bot Service | Azure Notification Service | Azure OpenAI | Azure AI Search | AWS EC2 | AWS Elastic Beanstalk | AWS S3 | AWS SES | AWS Security | Azure Managed Database ✔️Database Microsoft SQL Server | PostgreSQL | Azure Cosmos DB | MongoDB | MySQL | Oracle | Vector Databases (Pinecone | Milvus | Weaviate) ✔️Authentication & Authorization OpenIDConnect | OAuth 2.0 | Microsoft Entra / Azure AD + B2C | OpenIddict + Identity Server | Keycloak | Auth0 | Okta | IAM Security ✔️Background Services & Jobs ASP.NET Core Hosted Services | Hangfire | Quartz.NET | Celery | Rust Background Job | Windows Service Background Jobs ✔️Caching Redis (Distributed Caching) | Memcached | In-Memory Caching for Single Instance ✔️AI Development & Agentic Workflows LangChain | Semantic Kernel | LangGraph | CrewAI | AutoGen | LlamaIndex | MCP Server | RAG Pipelines | Multi-agent Orchestrator | n8n | VAPI (Voice AI) | Generative AI ✔️AI-Powered Development & Productivity (Vibe Coding) Cursor | GitHub Copilot | Claude API | Antigravity | OpenAI API | Gemini API | Mistral API | AI-Assisted Architecture ✔️Development & Project Management Tools Azure DevOps | Jira | Trello | Slack | Postman | Swagger (OpenAPI) | Git | GitHub | Bitbucket | Confluence If you find my skillset good enough for you expectation then hit invite button and discuss further more.

I'm Full Stack Software Engineer and System Architect with over 15 years of hands-on experience. 🚀 𝗪𝗵𝗮𝘁 𝗜 𝗛𝗲𝗹𝗽 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀𝗲𝘀 𝗗𝗼: ✔ Automate operations using AI (Claude, MCP, AI workflows, integrations) ✔ Build SaaS platforms from idea to production ✔ Replace manual processes with smart systems 𝐓𝐮𝐫𝐧 𝐲𝐨𝐮𝐫 𝐀𝐈 𝐢𝐝𝐞𝐚 𝐢𝐧𝐭𝐨 𝐚 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐬𝐲𝐬𝐭𝐞𝐦, while you stay focused on growth. Have a vision for an AI Agent, RAG-powered assistant, or intelligent automation pipeline but 𝒅𝒐𝒏'𝒕 𝒌𝒏𝒐𝒘 𝒘𝒉𝒆𝒓𝒆 𝒕𝒐 𝒔𝒕𝒂𝒓𝒕? Let's talk, I offer a 𝐟𝐫𝐞𝐞 𝟑𝟎-𝐦𝐢𝐧𝐮𝐭𝐞 𝐬𝐭𝐫𝐚𝐭𝐞𝐠𝐲 𝐜𝐚𝐥𝐥 📞 to map your first steps and answer your hardest questions. 🚀 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 I architect and ship AI-powered products that integrate cleanly into your existing stack. From multi-agent orchestration with LangGraph and Claude MCP servers to semantic search pipelines and real-time AI dashboards, I focus on systems that work in production, not just in demos. 🧩 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 - 𝐀𝐈 𝐀𝐠𝐞𝐧𝐭𝐬 & 𝐌𝐂𝐏: Claude MCP servers, multi-agent workflows, autonomous task orchestration, LangChain, LangGraph, LlamaIndex, LangSmith - 𝐑𝐀𝐆 & 𝐆𝐞𝐧𝐀𝐈: Retrieval-Augmented Generation, semantic search, vector databases, OpenAI GPT-4o, Gemini, Mistral, HuggingFace, Stable Diffusion - 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭: Azure AI, AWS (Bedrock, SageMaker, Lambda), GCP, Docker, CI/CD pipelines - 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧 & 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧: n8n, API-based workflow automation, SaaS integrations, business process optimization - 𝐂𝐨𝐦𝐩𝐮𝐭𝐞𝐫 𝐕𝐢𝐬𝐢𝐨𝐧 & 𝐍𝐋𝐏: YOLO, Mask R-CNN, OpenCV, NLP pipelines, speech-to-text systems - 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐀𝐈 𝐀𝐩𝐩𝐬: Python FastAPI, Node.js, .NET Core backends · React, Angular, Blazor frontends 💡 𝐌𝐲 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 1. 𝐃𝐢𝐬𝐜𝐨𝐯𝐞𝐫𝐲 — Understand your goals, data constraints, and user needs 2. 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 — Select the right models, agent frameworks, and RAG pipelines 3. 𝐁𝐮𝐢𝐥𝐝 — Develop and integrate AI features into your product or platform 4. 𝐃𝐞𝐩𝐥𝐨𝐲 & 𝐌𝐨𝐧𝐢𝐭𝐨𝐫 — Ship to production with observability, evals, and iteration loops If you're building the next generation of AI-driven products, I'll help you architect, build, and scale it, right. 📅 𝐋𝐞𝐭'𝐬 𝐬𝐜𝐡𝐞𝐝𝐮𝐥𝐞 a call to explore how AI Agents and RAG can transform your project.

I am Full Stack .NET Developer with more than 14 years of experience in both frontend and backend development in various business domain. Usually, I am working now on ASP.NET Core, Blazor and Umbraco CMS. 𝗠𝘆 𝘀𝗸𝗶𝗹𝗹𝘀 𝗮𝗻𝗱 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲: ► ASP.NET Web Application Development - 14+ Years’ Experience ► ASP.NET MVC, ASP.NET Core, Web API, RESTful APIs, C#. LINQ, ADO.NET, Entity Framework ► Blazor Web Apps using MubBlazor and Syncfusion control ► CMS: DotNetNuke (DNN), Umbraco ► JavaScript, JQuery, Ajax, Json, XML, CSS3, HTML5, Bootstrap, Responsive Design, Telerik Kendo UI, Telerik Rad Control ► ReactJS, NextJS ► Database: SQL Server, PostgreSQL ► Azure App Service, Azure SQL Database, Azure Email Communication Service, ► Payment Gateway: Stripe, Authorize.net ► APIs (Facebook APIs, Google API etc) ► Source Control: SVN, GitHub, TFS ► AI Tools: GitHub Copilot, Chat GPT

I help businesses build scalable SaaS platforms, modernize legacy applications, and integrate AI into real-world workflows. 💻 With 15+ years of software engineering experience, I’ve worked with startups, universities, and established companies to deliver reliable, enterprise-grade solutions using .NET, React, Angular, Python, Azure, and AWS. 📈 By the Numbers ⏱️ 15+ Years Experience 💰 $100K+ Earned on Upwork 🕒 10K+ Hours Worked 🏆 Top Rated Freelancer 🤝 17 Successful Upwork Contracts 🚀 20+ Commercial Projects Delivered 🛠️ What I Specialize In 🚀 Full-Stack SaaS Development ▪️ .NET Core / ASP.NET Core ▪️ React & Angular ▪️ SQL Server & Entity Framework ▪️ REST & GraphQL APIs ▪️ Clean Architecture & Microservices ▪️ Scalable Enterprise Applications 🤖 AI & Generative AI Solutions ▪️ OpenAI / ChatGPT Integration ▪️ Retrieval-Augmented Generation (RAG) Pipelines ▪️ LangChain Workflows ▪️ LangGraph, CrewAI & AG2 Multi-Agent Systems ▪️ Vector Databases (Pinecone, Chroma, Qdrant) ▪️ Document Intelligence & AI Automation Solutions ☁️ Cloud & DevOps ▪️ Microsoft Azure & AWS ▪️ Docker & Kubernetes ▪️ GitHub Actions & Azure DevOps ▪️ CI/CD Pipeline Automation ▪️ Cloud-Native Architecture ▪️ Monitoring, Deployment & Scalability Optimization 🔗 Integrations & APIs ▪️ Third-Party API Integrations ▪️ Payment Gateway Integration ▪️ Analytics & Reporting Systems ▪️ Authentication & Authorization (OAuth, JWT, SSO) ▪️ Enterprise System Integration 🏗️ Architecture & Engineering ▪️ SOLID Principles & Design Patterns ▪️ Dependency Injection & Repository Pattern ▪️ Performance Optimization & Refactoring ▪️ Legacy Application Modernization ▪️ Testable & Maintainable Codebases 💬 𝐖𝐡𝐚𝐭 𝐌𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐒𝐚𝐲 "Mostafizur is extremely professional, cooperative, and creative. He’s thorough, detail-oriented, and suggests smart improvements. Highly recommended for full-stack development." "Excellent work, very responsive." "Highly recommend – was a great engineering resource for over 5 years." 📩 Let’s connect and discuss your project!

I am a Full Stack .NET Developer with expertise in ASP.NET Core, Kentico Xperience, Umbraco CMS, React, Blazor, Vue.js, and SQL Server. With 15+ years of experience and 16,000+ successful Upwork hours, I build scalable, secure, and high-performance enterprise web applications and CMS solutions. I specialize in delivering complete solutions — from backend architecture and database design to CMS implementation and modern frontend development. ✅ Core Services Backend & API Development ASP.NET Core MVC / Web API development RESTful API design & third-party integrations Authentication & authorization systems Custom business logic development SQL Server database design & performance optimization CMS Development Kentico Xperience implementation & customization Umbraco CMS development, upgrades & migrations Custom modules, widgets & extensions eCommerce & marketing automation setup Enterprise integrations & performance tuning Frontend Development React.js application development Vue.js SPA development Blazor Server & Blazor WebAssembly development Component-based UI architecture API integration with modern frontend frameworks Responsive, scalable, and optimized UI solutions 🚀 Technical Stack ASP.NET Core • C# • MVC • Web API • Blazor Kentico Xperience • Umbraco CMS React • Vue.js • JavaScript SQL Server • Azure • AWS • Git • CI/CD 💡 Why Clients Work With Me ✔ Enterprise-level full stack expertise ✔ Clean architecture & scalable solutions ✔ Strong debugging & performance optimization ✔ Professional communication & reliable delivery ✔ Long-term technical partnership mindset If you're looking for a senior Full Stack .NET developer who can handle backend systems, CMS platforms, and modern frontend frameworks — let's connect and discuss your project.

Hey! Thank you for viewing my profile. I have experience in developing GIS solutions for more than 5 years. I have a solid foundation in programming languages such as C# and Javascript, along with expertise in geospatial analysis, data management, and web mapping technologies. I have also experience in drone data analysis and visualization. With my proven track record in this field, I am confident to help you to create a high-quality GIS product. As I am a team player I assure you I will be a valuable asset to your team. My skills: - Full-stack Development - Database Management - Web Mapping - Data Processing - Data Visualization - Spatial Analysis - Version control & Collaboration Technologies: - Geographic Information System (GIS): QGIS - Database: PostgreSQL with PostGIS - Programming Languages: C#, Javascript, SQL - Framework: Asp.net Core with Identity, React - Web Mapping Libraries: CesiumJs, LeafletJs, OpenLayers, Potree - Version Control: Git, Github, BitBucket - Cloud Computing: Amazon Web Services (AWS) - GIS Data Formats: GeoJSON, Shapefile, KML, GeoTIFF, Point Cloud, OBJ, CityGML, DAE. - Spatial ETL: FME GIS C# Asp.net Core with Identity Javascript JQuery React CesiumJS LeafletJS OpenLayers PostgreSQL GeoServer QGIS HTML CSS Tailwind CSS Bootstrap Material UI Git AWS FME Feel free to contact me to discuss your requirements.