You will get expert bug fixing for ASP.NET Core, MVC, C# web applications
Top Rated
Top Rated
Project details
Need a custom web application built right the first time?
I design and develop modern, scalable web apps with ASP.NET Core, C#, and React from a simple business tool to a complete multi-user platform.
I am a Top Rated full-stack .NET developer with 7+ years of experience and 100% Job Success, with production systems live today: e-commerce & POS platforms, CRM systems, tutoring marketplaces, and SaaS products.
What you get:
→ Custom web application built with ASP.NET Core, C#, MVC & Entity Framework
→ Responsive frontend in React or Angular works on desktop, tablet & mobile
→ SQL Server / PostgreSQL database design with clean, scalable architecture
→ Secure REST APIs, role-based authentication & third-party integrations (Stripe, payment gateways, Google services)
→ Admin panels, dashboards & reporting
→ Deployment to Azure, AWS, or your hosting — fully configured
How I work: clear milestones, working demos as we go, and clean documented code you fully own. No surprises, no technical chaos.
From idea to launch message me with your requirements and I'll tell you exactly how I'd build it, with a realistic timeline.
I design and develop modern, scalable web apps with ASP.NET Core, C#, and React from a simple business tool to a complete multi-user platform.
I am a Top Rated full-stack .NET developer with 7+ years of experience and 100% Job Success, with production systems live today: e-commerce & POS platforms, CRM systems, tutoring marketplaces, and SaaS products.
What you get:
→ Custom web application built with ASP.NET Core, C#, MVC & Entity Framework
→ Responsive frontend in React or Angular works on desktop, tablet & mobile
→ SQL Server / PostgreSQL database design with clean, scalable architecture
→ Secure REST APIs, role-based authentication & third-party integrations (Stripe, payment gateways, Google services)
→ Admin panels, dashboards & reporting
→ Deployment to Azure, AWS, or your hosting — fully configured
How I work: clear milestones, working demos as we go, and clean documented code you fully own. No surprises, no technical chaos.
From idea to launch message me with your requirements and I'll tell you exactly how I'd build it, with a realistic timeline.
Programming Languages
JavaScript, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$75
|
Standard
$199
|
Advanced
$399
|
|---|---|---|---|
| Delivery Time | 2 days | 4 days | 7 days |
Number of Revisions | 1 | 2 | 3 |
Bug Investigation | |||
Fix Documentation | - | ||
Detailed Code Comments | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$30 - $100
Detailed Code Comments
(+ 1 Day)
+$100
Extra bug fix
(+ 1 Day)
+$50
Performance optimization (slow pages/queries)
(+ 3 Days)
+$200
Deployment fix (IIS/Azure hosting issues)
(+ 2 Days)
+$150Frequently asked questions
14 reviews
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KH
Kevin H.
May 16, 2025
Migration of Website
My organization used Muhammad for a long term project and he was amazing to work with. He was always available whenever we had issues. He followed our business requirements perfectly and was always quick to provide solutions and proper updates. We look forward to working with him again in the future,
MC
Michael C.
Apr 7, 2025
30 minute consultation
KH
Kevin H.
Dec 24, 2024
Fix Login Issues With Websites/WebApps
SR
Shawn R.
Nov 7, 2024
.Net Website Developer
Very helpful, would highly recommend!
AL
Atc L.
Aug 31, 2024
NATS project update
Was great to work with. Provided the update I needed fast and did exactly what I needed. Worked with him before and he was professional and created the project perfectly.
About Muhammad
Senior .NET Developer & AI Integration Specialist | OpenAI Claude API
100%
Job Success
Rawalpindi, Pakistan - 8:12 pm local time
I am Muhammad Qalb Abbas, a Top Rated Full Stack Developer with 7+ years of hands-on experience in ASP.NET Core, C#, React, and Angular, now specialising in AI integration using OpenAI API and Claude API. With a 100% Job Success Score across 20+ completed projects, I bring both deep technical expertise and the reliability clients come back for.
✅ Full Stack Developer — ASP.NET Core · React · Angular · C#
✅ AI Integration Specialist — OpenAI API · Claude API · Semantic Kernel · RAG Pipelines
✅ 7+ Years in ASP.NET MVC / ASP.NET Core · 3+ Years in React JS
✅ Expert Backend Engineer — REST APIs · Entity Framework · MS SQL · PostgreSQL
✅ API Development & Third-Party Integration Specialist
✅ Bug Fixing · Performance Optimisation · Legacy .NET Modernisation
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🤖 AI-POWERED APPLICATION DEVELOPMENT
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
I help businesses embed real, working AI into their existing systems — not demos, but production features that ship. Using OpenAI API (GPT-4o), Claude API (Anthropic), and Microsoft Semantic Kernel, I build:
→ AI chatbots & assistants integrated into ASP.NET Core web apps
→ Document Q&A systems using RAG (retrieval-augmented generation) pipelines
→ AI-powered workflow automation and intelligent search
→ Vector database integrations (pgvector, Pinecone)
→ Azure OpenAI Service deployments with proper auth, rate limiting & cost controls
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
⚙️ FULL STACK WEB DEVELOPMENT
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My core expertise in ASP.NET Core and C# development covers the full stack — from clean backend architecture to polished frontend UIs:
→ ASP.NET Core · ASP.NET MVC5 · ASP.NET Web API · .NET Core (3.1 / 5 / 6 / 7 / 8)
→ C# · ADO.NET · LINQ · Dapper ORM · Entity Framework · Repository Pattern · Dependency Injection
→ React JS · Angular · Blazor · JavaScript · TypeScript · jQuery · Bootstrap
→ MS SQL Server · PostgreSQL · Database design & query optimisation
→ Web Scraping · Admin Panel Development · SaaS product development
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
🔗 API & INTEGRATION EXPERTISE
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
→ RESTful API development & documentation
→ Third-party API integrations (payment gateways, CRMs, e-commerce platforms, Etsy, SignalR)
→ OpenAPI / Swagger · Secure token-based authentication (JWT, OAuth)
→ Real-time features with SignalR
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
☁️ CLOUD & DEVOPS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
→ Microsoft Azure · Azure OpenAI Service · Azure App Service
→ GitHub · CI/CD pipelines · Seq logging · Cloud deployment
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
💡 WHY CLIENTS CHOOSE ME
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"He was always available whenever we had issues. He followed our business requirements perfectly." — Kevin, 5-star review, 5-month engagement
✔ 100% Job Success Score · Top Rated on Upwork
✔ 0–4 hour average response time
✔ Clean, commented code with full project documentation
✔ I flag problems early — no surprises at the deadline
✔ Trained developers in ASP.NET Core and Angular — I explain clearly, not just deliver code
✔ 24/7 availability for urgent fixes and time-sensitive projects
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📌 WHAT I CAN BUILD FOR YOU
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
✦ AI-integrated web applications (OpenAI · Claude · Semantic Kernel)
✦ Custom ASP.NET Core / MVC web applications from scratch
✦ React JS and Angular single-page applications (SPAs)
✦ REST API development and third-party API integrations
✦ SaaS platforms — sales, finance, CRM, ERP systems
✦ Admin dashboards and data management panels
✦ Bug fixing, performance tuning and legacy .NET modernisation
✦ Real-time features with SignalR · Web scraping & data extraction
If you need a reliable Full Stack Developer who delivers AI-powered .NET solutions on time and to specs I'd love to work with you.
📩 Send me a message or invite me to your job. I respond within 4 hours.
Best regards,
Muhammad Qalb Abbas
Senior Full Stack Developer | AI Integration Specialist
Steps for completing your project
After purchasing the project, send requirements so Muhammad can start the project.
Delivery time starts when Muhammad receives requirements from you.
Muhammad works on your project following the steps below.
Revisions may occur after the delivery date.
Ensure requirements are complete and tested properly
I will address the client's requirements to the best of my abilities to ensure code delivery is well tested and works correctly.
Review requirements & confirm scope
I review your requirements, ask clarifying questions, and confirm the final feature list, screens, milestones, and timeline so we're fully aligned before development starts.