You will get I will fix bugs and issues in your C# / ASP.NET / .NET application
Project details
Is your C#, ASP.NET, or .NET application throwing errors, crashing, or behaving unexpectedly? I find the actual cause and fix it — not just patch the symptom.
I'm a full-stack .NET developer with 5+ years of experience maintaining production systems in banking, insurance, and government sectors, where debugging inherited and often undocumented code was my daily work. I'm comfortable jumping into an existing codebase, reproducing the problem, and delivering a clean fix with a clear explanation of what was wrong.
What I can fix: runtime errors and crashes, broken business logic, SQL Server / Entity Framework / Dapper query issues, API endpoints returning wrong results, Web Forms / MVC / ASP.NET Core issues, and deployment or configuration errors (IIS, connection strings).
Before fixing anything, I reproduce the issue and tell you what's actually wrong. You get the fix, a short root-cause summary, and confirmation that I tested the affected flows.
Tech: C#, ASP.NET Core, ASP.NET MVC, Web Forms, .NET 8, Entity Framework, Dapper, MS SQL Server, Oracle.
I'm a full-stack .NET developer with 5+ years of experience maintaining production systems in banking, insurance, and government sectors, where debugging inherited and often undocumented code was my daily work. I'm comfortable jumping into an existing codebase, reproducing the problem, and delivering a clean fix with a clear explanation of what was wrong.
What I can fix: runtime errors and crashes, broken business logic, SQL Server / Entity Framework / Dapper query issues, API endpoints returning wrong results, Web Forms / MVC / ASP.NET Core issues, and deployment or configuration errors (IIS, connection strings).
Before fixing anything, I reproduce the issue and tell you what's actually wrong. You get the fix, a short root-cause summary, and confirmation that I tested the affected flows.
Tech: C#, ASP.NET Core, ASP.NET MVC, Web Forms, .NET 8, Entity Framework, Dapper, MS SQL Server, Oracle.
Programming Languages
ASP.NET, TypeScript, C#Coding Expertise
Performance OptimizationWhat's included
| Service Tiers |
Starter
$60
|
Standard
$120
|
Advanced
$250
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 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
+$40 - $100
Additional Revision
+$30About C
Full-Stack .NET Developer | C# / ASP.NET Core / React | AI Integration
Taipei, Taiwan - 5:18 am local time
What I can do for you:
- Back-end development with C#, ASP.NET Core / MVC, .NET 8, Web API, MS SQL Server, and Oracle — from database design and Stored Procedure optimization to API integration and performance tuning
- Front-end development with Vue 3, React, Angular, and TypeScript, including responsive web design
- Legacy system modernization: I have migrated ASP.NET Web Forms systems to .NET Core, converted COBOL-based specifications into .NET applications, and reverse-engineered undocumented legacy code
- Cloud deployment on Azure (App Service, Azure SQL, Static Web Apps) with CI/CD via GitHub Actions
- AI integration: OpenAI / Azure OpenAI APIs, RAG pipelines, OCR, and document parsing — I recently built an AI-powered learning and grading platform with constrained GPT grading workflows and LINE Bot integration
I handle projects end-to-end: requirement analysis, database design, development, integration, deployment, and production support. I communicate clearly in written English, respond promptly, and deliver reliable, well-documented code.
Whether you need a new feature, a full application, or someone to rescue and modernize a legacy system, let's talk.
Steps for completing your project
After purchasing the project, send requirements so C can start the project.
Delivery time starts when C receives requirements from you.
C works on your project following the steps below.
Revisions may occur after the delivery date.
Review & reproduce
I review your code and reproduce the issue locally to confirm the actual cause before changing anything.
Diagnose & confirm
I identify the root cause and send you a short note on what's wrong, so you know what's being fixed.