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Fiverr Pro
English
$
USD
I will fix c sharp and dotnet bugs and errors
Quinten W
4.7
4.7
About this gig
Getting a C# exception, a crashing .NET app or an API that returns 500 errors? I'll find the root cause and fix it in your code.
I'm a C# .NET developer who builds ASP.NET Core APIs and deploys them to Azure, so I know where .NET apps break in real projects.
What I fix:
- Exceptions, crashes and build errors
- ASP.NET Core Web API and MVC bugs (routing, auth, dependency injection)
- Entity Framework Core and SQL Server errors
- Async, deadlock and performance issues
- WinForms, WPF, Blazor and Worker Service bugs
- NuGet and .NET upgrade errors
You get:
- The bug reproduced and fixed in your code style
- A short report: what broke, why, and what I changed
- The fix as a pull request or updated source code
Not included: building new apps or large new features. Message me for a custom offer.
Send me your bug description, error message or stack trace before buying and I'll tell you which package fits your package best.
Get to know Quinten W
Quinten W
Software Engineer
- FromNetherlands
- Member sinceSep 2026
- Avg. response time1 hour
- Last delivery2 days
Languages
English, Dutch, German, French
I am a final-year Computer Science and Software Engineering student at University of applied sciences Windesheim. I have multiple years of experience working as a software engineer and doing projects for company's. I had my own company set up using Azure as backend deployement and ASP .NET as framework for the backend.
I am specialized in .NET and Azure environments, but I am also experienced in PHP Laravel, AWS and Docker.
I primarily work with GitHub, but I am open to work with any git (or similar) environment (GitLab, DevOps, etc.).
My Portfolio
Other Software Development Services I Offer
FAQ
Which package do I need?
Basic is one bug that takes up to 1 hour. Standard covers up to 3 bugs or one harder issue (3 hours). Premium is up to 5 hours plus a code review. Send me the error first and I'll tell you which one fits.
What counts as one bug?
One problem with one root cause, like a specific exception, a broken feature or a wrong result, that fits in your package's hours. If a bug turns out bigger, I'll tell you before going further.
What if the bug takes longer than my package?
If I recommended you that package I will go untill it is fixed, if you bought it blindly you will have to purchase extra hours.
What if you can't fix the bug?
If I can't reproduce or fix it, I'll share what I found and we cancel the order through Fiverr for a full refund.
Which .NET versions and app types do you support?
C# on .NET Framework 4.x and .NET Core 3.1 up to .NET 10: ASP.NET Core Web API, MVC, Razor Pages, Blazor, WinForms, WPF, Worker Services and Azure Functions.
Will you explain what was wrong?
Yes. Every package includes a short report: what broke, why it happened and what I changed, so the same bug doesn't come back.
How will I receive the fix?
As a pull request on your GitHub, GitLab or Azure DevOps repository, so you can review every change, or as updated source code in a zip.
Is my code safe with you?
Your code is only used for your order and never shared. Please send test data and test credentials only, never production secrets.
Can you fix bugs in apps running on Azure?
Yes. I can debug apps on Azure App Service using logs and Application Insights. For a new deployment or CI/CD pipeline, see my Azure deployment gig.
Reviews
1 reviews for this Gig
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
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Most relevant
S sophie_bruye
Netherlands
Fast delivery, had time for 2 days and got it within 4 hours. Code quality is good and got a profesisonal explanation within the pull request. Replied within 15 minutes. Added them to the git repo and it was done. Would order again!
$50
Price
1 day
Duration
Q 
Seller's Response
Helpful?
Reviews
1 reviews for this Gig
| (1) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
S sophie_bruye
Netherlands
Fast delivery, had time for 2 days and got it within 4 hours. Code quality is good and got a profesisonal explanation within the pull request. Replied within 15 minutes. Added them to the git repo and it was done. Would order again!
$50
Price
1 day
Duration
Q Seller's Response
Helpful?
