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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.

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, ► APIs (Facebook APIs, Google API etc) ► Source Control: SVN, GitHub, TFS ► AI Tools: GitHub Copilot, Chat GPT

I help businesses develop scalable, secure, and high-performance web applications using ASP.NET, Blazor, C#, SQL Server, and modern frontend technologies. Over the last 10+ years, I have worked on: ✔ Enterprise Management Systems ✔ Survey & Assessment Platforms ✔ Appraisal Management Systems ✔ Dashboard & Reporting Solutions ✔ Legacy ASP.NET WebForms Modernization ✔ SQL Query & Stored Procedure Optimization ✔ API Development & Integration ✔ Performance Improvement Projects My expertise includes: • ASP.NET MVC • ASP.NET Core • Blazor Server • C# • SQL Server • LINQ • Entity Framework • JavaScript / jQuery • Tailwind CSS • REST API Integration • Database Optimization • Highcharts & Dashboard Analytics What I can help you with: ✅ Build complete business applications ✅ Improve slow SQL queries & stored procedures ✅ Optimize old ASP.NET systems ✅ Create responsive modern UI ✅ Develop admin dashboards ✅ Build survey & workflow systems ✅ API integration and backend development ✅ Bug fixing and maintenance Why clients work with me: ✔ Clean and maintainable code ✔ Strong communication ✔ Fast response time ✔ Long-term support ✔ Performance-focused development ✔ Business-oriented solutions If you are looking for a reliable Full Stack .NET Developer who can deliver scalable and professional solutions, feel free to invite me to your project.

I’m a full-stack developer with deep expertise in Angular and .NET, specializing in building seamless hybrid applications that bridge desktop and web. From crafting flicker-free UI with Angular route resolvers to architecting robust backend services in .NET Core, I deliver scalable, maintainable solutions with precision. 🔧 I thrive on solving complex activation flows, optimizing IPC mechanisms, and refining MSIX packaging for flawless deployment. Whether it's protocol activation, COM/DCOM interop, or registry cleanup—I've got it covered. 🚀 Let’s build something powerful, elegant, and ready for global scale.

Build investor-grade SaaS for scale & speed 🔐 Trusted by global universities + enterprises 💻 𝟭5+ 𝘆𝗿𝘀 𝗳𝘂𝗹𝗹-𝘀𝘁𝗮𝗰𝗸 | .𝗡𝗘𝗧 𝗖𝗼𝗿𝗲, 𝗔𝗻𝗴𝘂𝗹𝗮𝗿, 𝗖𝗹𝗲𝗮𝗻 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲, 𝗔𝘇𝘂𝗿𝗲 𝗖𝗹𝗼𝘂𝗱 🛠️ Rescue legacy codebases, accelerate releases, build testable & maintainable SOLID architecture 🤖 𝗔𝗜 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 𝗘𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 Designed and implemented production-ready RAG systems using OpenAI APIs, vector databases (Pinecone / Chroma / Qdrant), and LangChain — delivering document-driven Q&A solutions with PDF ingestion, embeddings, retrieval, and response generation. 🔧 Known for rescuing legacy systems, optimizing performance, and delivering clean, testable, SOLID architectures that scale reliably under heavy load. 🛠️ 𝐂𝐨𝐫𝐞 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 ▪️𝐁𝐚𝐜𝐤𝐞𝐧𝐝: .NET Core, .NET MVC/Core, Entity Framework, LINQ, SQL Server, Python (NumPy, Pandas, TensorFlow basics), OpenAI API / ChatGPT integration, LangChain, RAG workflow, Vector Databases (Pinecone / Chroma / Qdrant) ▪️ 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: Angular(Ngrx, Rxjs), React( Hooks, Redux), 𝗧𝗲𝗹𝗲𝗿𝗶𝗸 𝗨𝗜, 𝗜𝗴𝗻𝗶𝘁𝗲 𝗨𝗜,HTML5, CSS3, TypeScript, JavaScript ▪️ 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: Cloud & DevOps: Azure/AWS, Docker/Kubernetes, CI/CD pipelines (Azure DevOps, GitHub Actions) ▪️ 𝐂𝐈/𝐂𝐃 & 𝐀𝐮𝐭𝐨𝐦𝐚𝐭𝐢𝐨𝐧: GitHub Actions, Azure DevOps – with robust testing and deployment pipelines ▪️ 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧𝐬: REST & GraphQL APIs, payment gateways, analytics, and third-party services ▪️ 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞: Clean Architecture, Microservices, Repository pattern, Dependency Injection 🚀 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐬 ▪️ Balanced full-stack capability – strong backend with polished frontend skills ▪️ Clean, testable, maintainable code – following SOLID, DRY, and design patterns ▪️ CI/CD pipelines with automation testing – enabling faster, safer releases ▪️ Cloud-native development – scalable services using Azure and AWS infrastructure ▪️ Cross-functional collaboration – experienced in Agile/Scrum teams with QA, UI/UX, and PMs 🎯 𝐖𝐨𝐫𝐤𝐢𝐧𝐠 𝐖𝐢𝐭𝐡 𝐌𝐞 – 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐆𝐞𝐭 ▪️ 𝐍𝐨 𝐦𝐨𝐫𝐞 𝐬𝐭𝐫𝐞𝐬𝐬 𝐨𝐯𝐞𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐲 – I handle clear documentation, realistic timelines, and scalable SOLID-based architecture ▪️ 𝐈 𝐫𝐞𝐬𝐜𝐮𝐞𝐝 𝐦𝐞𝐬𝐬𝐲 𝐜𝐨𝐝𝐞𝐛𝐚𝐬𝐞𝐬 – turned them into clean, stable solutions ready for production ▪️ 𝐁𝐮𝐢𝐥𝐝 𝐢𝐧𝐯𝐞𝐬𝐭𝐨𝐫-𝐫𝐞𝐚𝐝𝐲 𝐬𝐲𝐬𝐭𝐞𝐦𝐬 – anticipate objections, deliver reusable modules, and polish your pitch decks ▪️ 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐰𝐢𝐭𝐡 𝐜𝐨𝐦𝐩𝐥𝐞𝐱 𝐝𝐨𝐦𝐚𝐢𝐧𝐬 – including vehicle management, German-language portals like freigabeportal.at, and admin systems 💬 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!

Hello! Thanks for visiting my profile. I have over 6 years of experience with great knowledge in front/back-end website (ASP.NET/ASP.NET Core) development and e-commerce Services. I am a hardworking, highly proficient Full Stack Web Developer & Nopcommerce Expert. Areas of Specialization: -Full-Stack Web Development (ASP.NET Core, MVC, C#) -Responsive, Cross-Browser Website Design (HTML5, CSS3, Bootstrap) -Front-End Development with React.js, Angular, JavaScript, and jQuery -Cloud Deployment & CI/CD Automation Technical Expertise -Backend: .NET Core, ASP.NET MVC 5, C# -Frontend: React.js, Angular, JavaScript (ES6+), jQuery, HTML5, CSS3, Bootstrap -Database: Postgres ,SQL Server -DevOps & Deployment: Docker, Kubernetes, AWS (ECS, ECR, CloudWatch), GitLab CI/CD -Others: AJAX, REST APIs, Clean Architecture, LINQ, Entity Framework I am self-organized, detail-oriented, and really passionate about the highest quality in my work as I believe in the highest quality work. I'm always open to new opportunities, as well I'm also in touch with a small group of professional developers, who can help me with your projects, in case you need any boost in development. Please contact me, I'll be glad to talk with you about your project! Thank you for the time to read my profile. Best Regards! Karim Reza ul