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Need an AI product that actually works with your business data, APIs and existing software? I design and build production-grade AI agents, RAG platforms, knowledge systems and intelligent workflows, backed by 10+ years of enterprise software engineering. I work across the complete stack, including Python, .NET, Rust, Node.js, React, Azure, AWS and GCP, so you don't need separate AI, backend and architecture specialists just to get your product into production.

I am a Senior Software Engineer specializing in C#, .NET, Blazor (Blazor WebAssembly & Blazor Server), Python (Django & FastAPI), and React, with a strong background in designing and delivering robust, scalable, and high-performance web applications, particularly in SaaS, FinTech, and ERP domains. My core expertise spans across .NET Core Web API, ASP.NET MVC, Blazor Server, Blazor WebAssembly, Django, FastAPI, and modern full-stack architectures. I have extensive hands-on experience with Blazor component libraries, including MudBlazor, Radzen Blazor, Ignite UI, and Syncfusion, enabling me to build rich, responsive, and enterprise-grade user interfaces. I am equally proficient in Python-based backend development, building secure RESTful APIs, high-performance services, and data-driven systems using Django and FastAPI, tailored for scalable SaaS platforms, FinTech solutions, and ERP systems. I regularly work with full-stack architectures such as Django + React and .NET + Blazor, ensuring clean design patterns, maintainability, and optimal performance. My experience also includes backend automation, data processing, and designing efficient, concurrent systems to support complex business workflows and financial operations. I am a proactive problem solver who thrives in Agile environments, values clean code and best practices, and collaborates effectively within cross-functional teams. I am easygoing, open-minded, and highly adaptable, with the flexibility to work seamlessly across different time zones. Currently, I am available and highly motivated to contribute to impactful, innovative, and high-value SaaS, FinTech, and ERP projects.

Lead .NET Developer | ASP.NET Core, Blazor, Web API, AWS Need a dependable .NET developer who can understand your business, solve technical problems, and deliver software that is built to last? I am a Lead .NET Developer with more than 17 years of experience building, improving, and supporting web applications for startups, growing businesses, and enterprise organisations. My core expertise includes C#, ASP.NET Core, ASP.NET MVC, Blazor, Web API, SQL Server, AWS, and legacy ASP.NET applications. I work on everything from new product development and enterprise systems to application modernisation, performance improvements, integrations, and complex bug fixing. I have worked with clients across the USA, Canada, the UK, Australia, and Switzerland in industries such as finance, healthcare, SaaS, CRM, ERP, e-commerce, inventory management, legal services, and education. What I Can Help You Build or Improve ✔ Custom ASP.NET Core and ASP.NET MVC applications ✔ Blazor Server and Blazor WebAssembly solutions ✔ REST APIs and secure backend systems ✔ SaaS, CRM, ERP, and enterprise platforms ✔ Legacy ASP.NET and Web Forms maintenance ✔ ASP.NET 2.0 and 3.5 bug fixing and upgrades ✔ Migration from older .NET systems to modern .NET ✔ Third-party API and payment gateway integrations ✔ SQL Server optimisation and database improvements ✔ AWS deployment and CI/CD setup ✔ Code refactoring, performance tuning, and troubleshooting ✔ Ongoing development and long-term technical support My Technical Background Backend: C#, .NET, ASP.NET Core, ASP.NET MVC, ASP.NET Web Forms, Blazor, Web API, Entity Framework Core, Dapper, ADO.NET Frontend: HTML5, CSS3, JavaScript, Bootstrap, Tailwind CSS, jQuery, React, Angular Databases: SQL Server, MySQL, Oracle Architecture: Clean Architecture, Onion Architecture, SOLID, CQRS, MediatR, Repository Pattern, Dependency Injection, Microservices Cloud and DevOps: AWS, Git, Gitea, CI/CD, deployment automation Security and Integrations: JWT, ASP dot NET Identity, Swagger, Stripe, PayPal, Authorize dot net, Alarm dot com, and custom API integrations What You Can Expect From Me You can expect clear communication, honest technical advice, well-structured code, and reliable delivery. I take ownership of the work I accept. I do not just complete tasks. I look at the bigger picture, identify risks, suggest practical improvements, and make sure the solution supports your long-term goals. I am especially comfortable working with complex applications, older systems, incomplete documentation, performance issues, and projects that need a senior developer to bring structure and direction. Whether you are building something new, modernising an existing application, fixing a difficult issue, or looking for a long-term .NET partner, I would be happy to discuss your project. Send me a message with a brief overview of your requirements, current challenges, and technology stack. I will review the details and help you identify the best way forward.

𝐍𝐞𝐞𝐝 𝐚 𝐒𝐞𝐧𝐢𝐨𝐫 .𝐍𝐄𝐓 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐰𝐡𝐨 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐬 𝐫𝐞𝐥𝐢𝐚𝐛𝐥𝐞, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐬𝐨𝐟𝐭𝐰𝐚𝐫𝐞—𝐧𝐨𝐭 𝐣𝐮𝐬𝐭 𝐜𝐨𝐝𝐞? 𝐈'𝐦 𝐚𝐯𝐚𝐢𝐥𝐚𝐛𝐥𝐞 𝐟𝐨𝐫 𝐟𝐫𝐞𝐞𝐥𝐚𝐧𝐜𝐞 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐚𝐧𝐝 𝐥𝐨𝐧𝐠-𝐭𝐞𝐫𝐦 𝐫𝐞𝐦𝐨𝐭𝐞 𝐨𝐩𝐩𝐨𝐫𝐭𝐮𝐧𝐢𝐭𝐢𝐞𝐬. 𝐈𝐟 𝐲𝐨𝐮'𝐫𝐞 𝐥𝐨𝐨𝐤𝐢𝐧𝐠 𝐟𝐨𝐫 𝐚 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐡𝐨 𝐜𝐨𝐦𝐦𝐮𝐧𝐢𝐜𝐚𝐭𝐞𝐬 𝐜𝐥𝐞𝐚𝐫𝐥𝐲, 𝐭𝐚𝐤𝐞𝐬 𝐨𝐰𝐧𝐞𝐫𝐬𝐡𝐢𝐩, 𝐚𝐧𝐝 𝐝𝐞𝐥𝐢𝐯𝐞𝐫𝐬 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧-𝐫𝐞𝐚𝐝𝐲 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬, 𝐥𝐞𝐭'𝐬 𝐭𝐚𝐥𝐤. I'm a 𝐒𝐞𝐧𝐢𝐨𝐫 𝐒𝐨𝐟𝐭𝐰𝐚𝐫𝐞 𝐄𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐰𝐢𝐭𝐡 𝟏𝟎+ 𝐲𝐞𝐚𝐫𝐬 𝐨𝐟 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 building secure, scalable, and high-performance applications using the Microsoft .NET ecosystem. I specialize in designing clean, maintainable solutions that solve real business problems and support long-term growth. 𝐈 𝐥𝐞𝐯𝐞𝐫𝐚𝐠𝐞 𝐦𝐨𝐝𝐞𝐫𝐧 𝐀𝐈-𝐚𝐬𝐬𝐢𝐬𝐭𝐞𝐝 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐭𝐨𝐨𝐥𝐬, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠 𝐂𝐥𝐚𝐮𝐝𝐞 𝐂𝐨𝐝𝐞, 𝐂𝐨𝐝𝐞𝐱 𝐚𝐧𝐝 𝐂𝐡𝐚𝐭𝐆𝐏𝐓, 𝐭𝐨 𝐚𝐜𝐜𝐞𝐥𝐞𝐫𝐚𝐭𝐞 𝐝𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 𝐰𝐡𝐢𝐥𝐞 𝐦𝐚𝐢𝐧𝐭𝐚𝐢𝐧𝐢𝐧𝐠 𝐡𝐢𝐠𝐡 𝐜𝐨𝐝𝐞 𝐪𝐮𝐚𝐥𝐢𝐭𝐲, 𝐭𝐞𝐬𝐭𝐢𝐧𝐠, 𝐚𝐧𝐝 𝐛𝐞𝐬𝐭 𝐩𝐫𝐚𝐜𝐭𝐢𝐜𝐞𝐬. 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮 𝐖𝐢𝐭𝐡 ✔ AI-powered applications & AI Agent integration ✔ ASP.NET Core Web Applications ✔ RESTful APIs & Backend Development ✔ Blazor Server & Blazor WebAssembly ✔ Enterprise Software Development ✔ Legacy Application Modernization ✔ Database Design & Performance Optimization ✔ Third-party API & Payment Gateway Integration ✔ Bug Fixing, Refactoring & Performance Improvements 𝐂𝐨𝐫𝐞 𝐒𝐤𝐢𝐥𝐥𝐬 & 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐢𝐞𝐬 𝐋𝐚𝐧𝐠𝐮𝐚𝐠𝐞𝐬 & 𝐅𝐫𝐚𝐦𝐞𝐰𝐨𝐫𝐤𝐬: C#, .NET 8/9/10, ASP.NET Core, ASP.NET MVC, Web API 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 & 𝐃𝐞𝐬𝐢𝐠𝐧 𝐏𝐚𝐭𝐭𝐞𝐫𝐧𝐬 & 𝐏𝐫𝐢𝐧𝐜𝐢𝐩𝐥𝐞𝐬: RESTful APIs, Clean Architecture, Layered Architecture, Vertical Slice Architecture, Domain-Driven Design (DDD), CQRS, Repository Pattern, Mediator Pattern, OOP, SOLID, DRY, KISS, YAGNI & Clean Code 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬 & 𝐎𝐑𝐌: SQL Server, Entity Framework Core, Dapper, LINQ, Stored Procedures 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: Azure, Azure DevOps, GitHub Actions, CI/CD 𝐓𝐞𝐬𝐭𝐢𝐧𝐠: xUnit, Unit Testing, Integration Testing, Architecture Testing(NetArchTest.Rules), Fluent Assertions, Shouldly, NSubstitute 𝐎𝐛𝐬𝐞𝐫𝐯𝐚𝐛𝐢𝐥𝐢𝐭𝐲 & 𝐃𝐨𝐜𝐮𝐦𝐞𝐧𝐭𝐚𝐭𝐢𝐨𝐧: Swagger/OpenAPI, Scalar, API Versioning, Health Checks, Serilog 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝: Blazor, MudBlazor, Razor Pages, Bootstrap 𝐀𝐈 & 𝐈𝐧𝐭𝐞𝐥𝐥𝐢𝐠𝐞𝐧𝐭 𝐒𝐲𝐬𝐭𝐞𝐦𝐬: Generative AI, AI Agents, OpenAI Integration, AI Chatbot Development 𝐓𝐨𝐨𝐥𝐬: Visual Studio, SSMS, Postman, Insomnia, Git, Jira, Trello, Slack, Copilot, Claude, Codex. I write clean, well-tested, maintainable code, communicate proactively, and focus on delivering software that is reliable, scalable, and easy to maintain. 𝐖𝐡𝐞𝐭𝐡𝐞𝐫 𝐲𝐨𝐮 𝐧𝐞𝐞𝐝 𝐚 𝐧𝐞𝐰 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧, 𝐬𝐜𝐚𝐥𝐚𝐛𝐥𝐞 𝐀𝐏𝐈𝐬, 𝐀𝐈 𝐢𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧, 𝐨𝐫 𝐚𝐧 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞𝐝 .𝐍𝐄𝐓 𝐞𝐧𝐠𝐢𝐧𝐞𝐞𝐫 𝐭𝐨 𝐬𝐭𝐫𝐞𝐧𝐠𝐭𝐡𝐞𝐧 𝐲𝐨𝐮𝐫 𝐭𝐞𝐚𝐦, 𝐈'𝐝 𝐛𝐞 𝐡𝐚𝐩𝐩𝐲 𝐭𝐨 𝐡𝐞𝐥𝐩. 𝐒𝐞𝐧𝐝 𝐦𝐞 𝐚 𝐦𝐞𝐬𝐬𝐚𝐠𝐞, 𝐚𝐧𝐝 𝐥𝐞𝐭'𝐬 𝐝𝐢𝐬𝐜𝐮𝐬𝐬 𝐲𝐨𝐮𝐫 𝐩𝐫𝐨𝐣𝐞𝐜𝐭.

I help businesses build scalable SaaS platforms, modernize legacy applications, and integrate AI into real-world workflows. 💻 Senior Full-Stack Engineer with 15+ years of software engineering experience, 10,000+ hours logged, and over $100K earned on Upwork. I specialize in writing clean, maintainable, high-performance code for full-stack web applications and building custom AI capabilities. Whether you need a reliable senior engineer to build features from scratch, stabilize a legacy .NET codebase, or build advanced RAG and AI agent systems, I deliver dependable code with minimal friction. 🔹 Core Technical Stack 🏆 Backend & APIs: .NET 8/9, ASP.NET Core, C#, SQL Server, Entity Framework Core, REST/GraphQL, Clean Architecture. 💻 Frontend Development: React, Angular, Blazor, TypeScript, Tailwind CSS, State Management (Redux/NgRx). 🧠 AI & Automation: RAG Pipelines, LangChain, LangGraph, CrewAI, Multi-Agent Workflows, Vector DBs (Pinecone, Qdrant), OpenAI API. 🚀 Cloud & DevOps: Microsoft Azure, AWS, Docker, CI/CD Pipeline Automation (GitHub Actions, Azure DevOps). 🕒 Availability & Communication I am available for full-time, long-term engagements. I offer flexible hours to ensure seamless overlap with US, UK, and EU time zones for daily stand-ups and team collaboration. 💬 What Clients Say "Mostafizur is extremely professional, cooperative, and creative... Highly recommended for full-stack development." "Great engineering resource for over 5 years." 📩 Next Steps Looking for a dependable senior engineer to join your team? Click Invite to Job or send me a message. Let's jump on a quick call to discuss your technical roadmap!

Enterprise .NET Engineer | Blazor, REST APIs, MSSQL, Dapper, Clean Architecture, CQRS I am an Enterprise .NET Engineer with 4+ years of experience designing, developing, and maintaining high-performance, scalable web applications using the Microsoft technology stack. I specialize in ASP DOT NET Core, Blazor, REST API architecture, MSSQL Server, Dapper, Clean Architecture, and the CQRS pattern—delivering robust, maintainable enterprise solutions. I help organizations build modern systems with clean code, optimized database structures, and secure, predictable features. Whether you need a complete application built from scratch or improvements to an existing system, I provide dependable engineering with strong attention to detail. Stored Procedure–Driven Architecture for Faster Deployment & Easier Support I design applications that utilize well-structured MSSQL stored procedures to reduce deployment effort and simplify ongoing support. By placing key business logic in the database layer, most updates can be applied without redeploying the entire application—minimizing downtime and reducing support overhead. Benefits include: Faster updates and shorter deployment cycles Quicker issue resolution through targeted database-level fixes Higher performance via optimized queries Cleaner and easier-to-maintain application code Fewer production headaches for teams and clients Core Expertise ASP DOT NET Core Web Apps (MVC, Razor Pages, Web API) Blazor Server & Blazor WebAssembly Clean Architecture & CQRS pattern MSSQL Server design, tuning, and stored procedures High-performance data access with Dapper ORM Authentication & Authorization (JWT, Identity) Enterprise-grade REST API design and integrations Application optimization, debugging, and modernization What You Can Expect Clear communication and accurate requirement analysis Clean, maintainable, well-documented code Scalable architecture suitable for long-term growth On-time delivery with proactive updates Post-deployment support and continuous improvements I am available for both long-term contract roles and project-based engagements. If you need a reliable .NET engineer who can deliver secure, high-quality software aligned with enterprise standards, I would be glad to collaborate.