Hire the Best ASP.NET Developers

🚀 Looking for a reliable .NET developer who can build, modernize, or scale your web application? I'm a Lead .NET Developer with 11+ years of professional experience building secure, scalable, and high-performance web applications using C#, ASP.NET Core, ASP.NET MVC, Blazor, Web API, and Azure. I help startups, SMEs, and enterprise organizations transform ideas into reliable software through clean architecture, modern development practices, and business-focused solutions. Over the years, I've delivered enterprise applications for clients across the USA, Canada, Australia, Switzerland, and the UK, serving industries including Finance, Healthcare, SaaS, CRM, ERP, Inventory Management, E-commerce, Legal Services, and Education. Whether you need a new application, modernization of a legacy system, or continuous enhancement of an existing platform, I focus on writing clean, maintainable code that delivers long-term value. What I Can Help You With ✔ Custom ASP.NET Core & ASP.NET MVC Web Applications ✔ Blazor Server & Blazor WebAssembly Development ✔ RESTful Web API & Backend Development ✔ Enterprise Application Development ✔ Legacy Application Modernization & Migration ✔ Microservices & Scalable System Architecture ✔ Database Design & Performance Optimization ✔ Third-Party API & Payment Gateway Integration ✔ Azure Cloud Deployment & CI/CD ✔ Bug Fixing, Performance Optimization & Code Refactoring Technical Expertise Languages & Frameworks: C#, ASP.NET Core, ASP.NET MVC, Blazor (Server & WebAssembly), Web API Frontend: HTML5, CSS3, JavaScript, Bootstrap, Tailwind CSS, jQuery, React (Basic), Angular (Basic) Databases & ORM: SQL Server, PostgreSQL, MySQL, Oracle, Redis, Entity Framework Core, Dapper Architecture & Development: Clean Architecture, Onion Architecture, SOLID, CQRS, MediatR, Repository Pattern, Dependency Injection Cloud & DevOps: Azure, Azure DevOps, AWS, Git, CI/CD Security & Integrations: JWT Authentication, ASP.NET Identity, REST APIs, Swagger/OpenAPI, Third-Party API Integration, Stripe, PayPal, Shopify API Why Clients Choose Me ✔ 11+ Years of Professional .NET Development Experience ✔ Clean, Scalable & Maintainable Code ✔ Strong Problem-Solving & Analytical Skills ✔ Clear & Proactive Communication ✔ Reliable Delivery with High-Quality Standards ✔ Long-Term Technical Support & Collaboration I believe great software is more than writing code—it's about understanding business goals, solving complex problems, and delivering solutions that are reliable, scalable, and built for the future. If you're looking for a dependable Lead .NET Developer who takes ownership, communicates effectively, and delivers high-quality solutions on time, I'd love to discuss your project and help turn your ideas into successful software. Let's build something exceptional together.

✅ Available Now ✅ Top Rated Freelancer on Upwork ✅ 7+ Years of Professional .NET Development Experience ✅ Computer Science Graduate with Strong Programming Skills I'm a Senior .NET Developer specializing in ASP.NET Core, ASP.NET MVC, ASP.NET Web Forms, C#, .NET Core, SQL Server, REST API development, and Acumatica ERP customization. I started my .NET career in 2014, working with ASP.NET Classic, ASP.NET Web Forms, and ASP.NET MVC applications. Over the years, I've worked on both legacy .NET Framework applications and modern ASP.NET Core solutions. This gives me the experience to maintain older applications while also building modern .NET applications using the latest Microsoft technologies. Legacy .NET Application Development : Many businesses still run applications built with ASP.NET Classic, ASP.NET Web Forms, ASP.NET MVC, and older versions of the .NET Framework. These applications are often business-critical and require developers who understand both the old architecture and modern .NET. I help clients maintain and improve existing .NET applications by fixing bugs, adding new features, modifying existing functionality, improving performance, integrating third-party APIs, and completing unfinished projects. I also modernize legacy applications by upgrading ASP.NET MVC applications to ASP.NET Core, converting ASP.NET Web Forms applications to ASP.NET MVC where required, and upgrading older .NET Framework applications to modern .NET Core and the latest .NET versions. Modern ASP.NET Core Development : Along with legacy systems, I build modern web applications using ASP.NET Core, ASP.NET Core MVC, C#, .NET Core, .NET 6, .NET 8, .NET 10, SQL Server, Entity Framework Core, LINQ, ADO.NET, and Razor Pages. Whether you need a new business application, an internal management system, a customer portal, or a REST API, I can build clean, maintainable, and scalable .NET solutions based on your business requirements. API Development & Frontend Integration : I develop REST APIs and ASP.NET Web APIs and integrate third-party services into .NET applications. I also build .NET backend applications that work with Angular, Blazor, and React frontends. I've worked with Angular since Angular 2 and have experience connecting modern frontend frameworks with secure and scalable ASP.NET Core backends. Acumatica ERP Development : In addition to .NET development, I specialize in Acumatica ERP customization and development. I've worked on Acumatica projects involving custom screens, DAC Extensions, Graph Extensions, Generic Inquiries (GI), Report Designer, business logic customization, workflow customization, REST API integrations, SOAP API integrations, Import & Export Scenarios, Manufacturing customizations, Distribution customizations, custom tables, custom data providers, and Field Service customizations. I also help clients modify existing Acumatica customizations, fix issues, improve business workflows, and develop new functionality based on their business requirements. Technologies : ASP.NET Classic, ASP.NET Web Forms, ASP.NET MVC, ASP.NET Core, ASP.NET Core MVC, .NET Framework, .NET Core, .NET 6, .NET 8, .NET 10, C#, SQL Server, Entity Framework, Entity Framework Core, LINQ, ADO.NET, Razor Pages, Blazor, Angular, React, REST API, ASP.NET Web API, HTML, CSS, JavaScript, Bootstrap, Azure, Git, Azure DevOps, and Acumatica ERP. If you're looking for a .NET Developer who can build new ASP.NET Core applications, maintain legacy ASP.NET applications, upgrade existing .NET systems, develop REST APIs, integrate third-party services, or customize Acumatica ERP, I'd be happy to discuss your project.

I am a Senior .NET Developer and Solution Architect with 12+ years of experience designing, developing, and scaling enterprise applications, startup MVPs, and long-term software products. I help businesses transform ideas into reliable, maintainable, and scalable solutions using modern Microsoft technologies and cloud platforms. Whether you need an MVP to validate a startup concept, modernization of a legacy application, or architecture guidance for a growing product, I can contribute both technically and strategically. What I specialize in: ✅ Enterprise Web Applications ✅ Startup MVP Development ✅ SaaS Platforms & Multi-Tenant Systems ✅ Microservices & Distributed Architecture ✅ RESTful APIs & Third-Party Integrations ✅ Legacy Application Modernization ✅ Long-Term Product Development Partnerships ✅ Technical Leadership & Architecture Consulting Core Technologies Backend C#, ASP.NET MVC, ASP.NET Core (.NET 6/7/8) REST APIs, OAuth, JWT Authentication Entity Framework, Dapper, ADO.NET Microservices, Clean Architecture, SOLID Principles Unit & Integration Testing (xUnit, NUnit, Moq) Frontend React TypeScript JavaScript, jQuery HTML5, CSS3, Bootstrap Databases SQL Server PostgreSQL MySQL MongoDB and other NoSQL solutions Cloud & DevOps Microsoft Azure (Azure SQL, App Services, Functions, Storage) AWS GitHub, Azure DevOps, Bitbucket Agile and Scrum methodologies Why Clients Work With Me ✔ Top Rated Plus freelancer with a 100% Job Success Score ✔ 12+ years of professional software development experience ✔ Strong focus on clean, maintainable, and scalable code ✔ Experience working with both startups and enterprise organizations ✔ Clear communication and long-term partnership mindset I believe software development is not just about writing code—it's about understanding business goals and building solutions that deliver measurable value. If you're looking for an experienced .NET professional who can architect systems, lead development efforts, or become a long-term technology partner, I'd be happy to discuss your project. Thank you

🌟 Transform Your Vision into Reality with a Trusted Tech Partner! 🌟 Hi there! I’m Ajay Kumar, a seasoned tech leader with 10+ years of expertise in Microsoft, Python, and Cloud technologies, leading a high-performing team that builds secure, scalable, and future-ready software solutions. Whether you’re building from scratch, modernizing legacy systems, or scaling cloud infrastructure — we make complexity feel simple. 🚀 What We Deliver 🔧 Full-Stack Development Expertise Backend Powerhouse: ✅ Microsoft Stack: ASP.NET MVC, .NET Core, REST APIs, JWT, Entity Framework, Microservices ✅ Python Stack: Django, FastAPI, Flask, Tornado, Bottle, Pyramid, Falcon, Eve — everything you need in Python development ✅ PHP Stack: Laravel, Core PHP, CodeIgniter ✅ AI/LLM Integration: Implement and fine-tune Large Language Models (LLMs) using OpenAI, HuggingFace, LangChain, RAG — for smart apps like: AI chatbots Document summarization Semantic search Recommendation systems Frontend Brilliance: ✅ Angular ✅ React.js ✅ Razor Pages ✅ HTML5/CSS3 ✅ JavaScript — responsive and modern UI/UX ☁️ Cloud & DevOps Mastery ✅ Azure: App Services, Functions, Blob Storage, Azure SQL, Azure AD, Azure DevOps ✅ AWS: Lambda, EC2, S3, RDS, API Gateway ✅ DevOps: CI/CD Pipelines, Docker, Kubernetes, Terraform, GitHub Actions, GitLab CI ✅ Cloud-Native Deployments: Secure and cost-efficient infrastructure 🔐 Secure, Scalable Data & Auth Systems ✅ Databases: SQL Server, PostgreSQL, MySQL — optimized for performance & scalability ✅ Authentication: JWT, OAuth2, Azure AD, Identity Server ✅ Version Control: Git, GitHub, GitLab, GitExtensions 🏭 Industries We Empower We serve FinTech, Healthcare, eCommerce, Logistics, EdTech, Real Estate, and 15+ other industries — delivering domain-aligned tech solutions with precision. 💡 Why Partner With Us? ✅ End-to-End Product Ownership — from UI to DevOps ✅ Microservices-Driven Architecture — effortless scalability ✅ Security-First Mindset — best practices & compliance (GDPR, HIPAA, etc.) ✅ Transparent Agile Development — sprint planning, daily standups, and demos ✅ Fast LLM Integration — build AI-powered features in days ✅ Full Python Stack coverage — Django, FastAPI, Flask, Tornado, Bottle, Falcon, Eve & more 🕒 Availability & Reliability ✅ 24/7 Support & Monitoring ✅ Flexible Engagement Models (Dedicated, Hourly, Fixed) ✅ Rapid Onboarding & Transparent Communication 🔖 #TechPartner #AzureDeveloper #AngularDeveloper #FullStackDevelopment #CloudSolutions #DevOps #PythonDevelopment #MicrosoftTechnologies #FastAPI #Django #Flask #LLMIntegration #Microservices #ASPNetCore #ReactJS #DatabaseManagement #CyberSecurity #AgileDevelopment #DigitalTransformation #eCommerce #Healthcare #FinTech #Logistics #PythonFullStack

🏆𝗜 𝗛𝗘𝗟𝗣 𝗖𝗢𝗠𝗣𝗔𝗡𝗜𝗘𝗦 𝗠𝗢𝗗𝗘𝗥𝗡𝗜𝗭𝗘, 𝗦𝗖𝗔𝗟𝗘, 𝗔𝗡𝗗 𝗦𝗧𝗔𝗕𝗜𝗟𝗜𝗭𝗘 𝗖𝗢𝗠𝗣𝗟𝗘𝗫 .𝗡𝗘𝗧 𝗦𝗬𝗦𝗧𝗘𝗠𝗦. Whether you're building a new SaaS platform, modernizing a legacy .NET application, or rescuing a system that's becoming difficult to maintain, I help you build software that's stable, scalable, and easier to evolve. Most clients come to me when: They’re starting a system and want to build it clean and scalable from day one Or the system already works… but feels fragile, slow, or hard to maintain Or growth is starting to break the architecture I step in, take ownership, and make sure the system is stable, scalable, and built to last. 🔹 QUICK SNAPSHOT ✔ 15+ years in .NET, SaaS, enterprise systems ✔ 100% Job Success on Upwork ✔ $50K+ delivered ✔ 2000+ hours on long-term systems ✔ Systems I built are still running after 10+ years 💡 My responsibility doesn't end when the code compiles. I make sure your system is maintainable, reliable, and ready for future growth. 🔧 WHAT I CAN HELP YOU WITH ✔ Stabilizing legacy .NET Framework applications ✔ Migrating to .NET Core / .NET 8 ✔ Designing scalable SaaS architecture ✔ Building and maintaining REST APIs ✔ Fixing performance & production issues ✔ Taking over systems where previous developers left 🧠 WHAT MAKES ME DIFFERENT Most projects don’t fail because of bad code they fail because NO ONE UNDERSTANDS THE SYSTEM anymore. I specialize in: • Understanding complex, undocumented systems • Fixing ROOT CAUSES, not symptoms • Improving architecture WITHOUT unnecessary rewrites Focus areas: • Clean, maintainable architecture • Long-term reliability • Proactive communication ⚙️ HOW I WORK I join as a SENIOR .NET ARCHITECT and not just a developer. ✔ I understand your system quickly ✔ I take ownership ✔ I work independently ✔ I focus on business impact 🧰 TECH STACK CORE TECHNOLOGIES Backend C#, .NET Framework, .NET 8, ASP.NET Core, Web API, Entity Framework, REST API, Web API Frontend Angular, Vue, TypeScript, Blazor, ASP.Net MVC Database SQL Server, PostgreSQL, MySQL, ORACLE Cloud & DevOps Azure DevOps, AWS, Docker, CI/CD Architecture SaaS Platforms, SaaS Archiecture, REST APIs, Microservices, Monolith, Legacy Modernization, Cloud Migration 🔄 SERVICES ✔ .NET Migration ✔ Legacy Modernization ✔ .NET Framework → .NET 8 ✔ Architecture Modernization ✔ Cloud Migration ✔ System Restructuring ⭐ REAL CLIENT FEEDBACK “Tremendous asset for large, long-term, complicated projects. He gets it done.” CTO, American Penaeid (2000+ hours) “He always gets the job done no matter how difficult it is.” Robin Pearl (10-year client) 💬 IF YOUR SYSTEM IS CRITICAL AND YOU NEED SOMEONE WHO CAN TRULY TAKE OWNERSHIP, LET’S TALK.

I'm a Full Stack Developer and .NET Developer with 10+ years building web applications that businesses actually run on. I take an idea and ship it — front end, back end, database, deployment — and I've done it for products still serving customers a decade later. ✦ WHAT I DO BEST My core stack is .NET and C#. As a .NET Developer I build secure, scalable back ends with .NET Core and ASP.NET Core, expose them as clean ASP.NET Web APIs (REST), and back them with Entity Framework and SQL Server, PostgreSQL. As a Full Stack Developer I pair those APIs with responsive front ends in Angular, React, or Blazor, then deploy and scale on Azure with Azure DevOps, Docker, and CI/CD. When a product needs AI, I wire proven models — often through a thin Python layer — into the application without breaking what already works. And when a templated WordPress or Shopify build has hit its ceiling, teams bring me in to rebuild it as a custom .NET web application that can actually grow. ✦ PROOF OF WORK Longevity is the point. I once took a rough idea from an automotive client and built it into an e-commerce platform that has served customers for nearly 15 years and still runs today. As the lead .NET Developer on Launch Control, a real-estate SaaS, I refactored the core and made the system 50x faster. I also built SiftScore, an AI-powered talent-acquisition platform that uses the OpenAI API to source and score large datasets. Across fintech, real-estate, and healthcare I've owned the full lifecycle as a Full Stack Developer: requirements, architecture, build, go-live. 🚀 SaaS MVP (From Idea → Production) When a client starts from a rough idea, I take it the full way: requirements, architecture, prototyping, build, and go-live on Azure. As a Full Stack Developer I've shipped .NET SaaS MVPs for fintech, real-estate, and conveyancing platforms — clean, maintainable code with the scalability and monitoring to grow once real customers arrive. ✦ AI Integration for Existing Products I add AI features when a product actually needs them. The fastest, most cost-efficient path is usually integrating a proven model — OpenAI, Claude, or Gemini, often through a thin Python layer — rather than training your own. I add chatbots, automation, and smart search to existing web apps. Most AI features fail not because of the model but because the surrounding .NET architecture wasn't built to support it — and that's where a senior Full Stack Developer earns their keep. ⚙️ Modernizing Existing .NET Systems - without the rewrite If you have a .NET or C# application that needs work, I optimize performance, refactor legacy code, upgrade aging ASP.NET back ends, and migrate data access to Entity Framework Core — refactored against SOLID principles, without freezing feature work. Stuck on an old ASP.NET WebForms app? You don't have to gamble on a big-bang rewrite. As a .NET Developer I migrated a WebForms spare-parts store — 20M+ products across 100+ suppliers — to ASP.NET MVC by running both side by side in one solution, so the business kept selling while the modernization happened underneath it. The same incremental approach moves teams off PHP, Laravel, or legacy WordPress builds and onto a maintainable .NET stack: ship value continuously, retire old code gradually, never go dark. ✦ Legacy .NET project modernization Old code isn't the enemy — downtime is. As a .NET Developer, I modernize legacy ASP.NET and ASP.NET MVC systems by introducing a clean API layer, migrating data access to Entity Framework Core, and refactoring against SOLID principles, all without freezing feature work. As a Full Stack Developer, I migrate the application page by page behind a feature flag, so new and old run together in production and you can switch any screen over — or roll it back instantly — without disrupting users. Whether it's an ASP.NET MVC application that has grown brittle or a WebForms system that needs a path forward, I find the route that lowers risk: incremental, tested, and reversible at every step. ✦ ENTERPRISE-GRADE .NET ARCHITECTURE My work as a Full Stack Developer goes deeper than features. On a large enterprise fintech platform built on microservices, as a Full Stack Developer I designed how the team builds — onboarding developers, setting architectural standards, and structuring a clean, maintainable .NET codebase that scales. As a .NET Developer with a decade across .NET Framework, .NET Core, ASP.NET, and ASP.NET MVC, plus an M.Sc. in Applied Mathematics behind the design decisions, means I build systems meant to last years, not quarters. I focus on web rather than native mobile apps in Flutter or React Native; on the .NET side I also ship cross-platform with .NET MAUI. I'm a web developer — my C# and .NET expertise powers web applications. ✦ HOW WE'LL WORK If you need a Full Stack Developer or .NET Developer who can take something from rough idea to production — and keep it running for years — let's talk about the fastest path to shipping it.