Browse categories
Explore
Fiverr Pro
English
$
USD
Looks Like This Service Is On Hold
I will fix bugs and errors in your aspnet core and c sharp project
Engr. M Rizwan
About this gig
Is your ASP.NET Core application throwing errors, crashing, or not behaving as expected? I fix bugs in existing .NET projects so you don't have to hand your codebase to a new developer or start over.
I'm a Senior Software Engineer with 9 years of experience building and maintaining ASP.NET Core, C#, Entity Framework Core, SQL Server, PostgreSQL, and REST APIs for production applications.
I can help with:
- ASP.NET Core & C# runtime errors and exceptions
- Web API / REST API bugs and integration errors
- Entity Framework Core issues (queries, migrations, relationships)
- SQL Server / PostgreSQL database problems
- JWT authentication and authorization issues
- Dependency Injection configuration errors
- Performance and slow-query troubleshooting
- Deployment and configuration issues (IIS, Azure, environment settings)
I work directly inside your existing codebase - no rewrites, no unnecessary changes, just a focused fix for the issue you're facing.
Before you order, please message me with your error message or a short description of the problem. This helps me confirm the right package and give you an accurate delivery time.
Let's get your application running smoothly again.
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Engr. M Rizwan
Engr. M Rizwan
Full Stack NET Developer, React, Nodejs, Azure, AI Agents and n8n Automation
- FromPakistan
- Member sinceOct 2017
- Avg. response time1 hour
- Last delivery7 years
Languages
Urdu, English
Senior Full Stack Software Engineer with 9 years of experience building scalable web applications and APIs. Expert in ASP.NET Core, C#, .NET, React, Node.js, SQL Server, PostgreSQL, Azure, Redis, and microservices. I also build AI Agents and n8n automations to streamline business workflows. I deliver clean, secure, high performance, and production ready solutions, from development and API integration to deployment and troubleshooting.
FAQ
Can you fix an existing ASP.NET Core project?
Yes. I specialize in fixing bugs in existing ASP.NET Core, .NET, and C# projects rather than building new ones from scratch.
Do you need my source code?
Yes, I'll need access to your project source code (via ZIP, GitHub/GitLab, or a private repo invite) to diagnose and fix the issue.
Can you fix database problems?
Yes, I troubleshoot SQL Server and PostgreSQL issues including slow queries, connection errors, and data integrity problems.
Can you fix Entity Framework Core issues?
Yes, including migration errors, query problems, relationship mapping, and performance issues with EF Core.
Can you fix API errors?
Yes, I debug REST/Web API issues such as failing endpoints, incorrect responses, integration errors, and routing problems.
Can you fix authentication and JWT problems?
Yes, I handle JWT authentication, authorization, and identity-related bugs in ASP.NET Core applications.
Can you fix deployment issues?
Yes, I can troubleshoot deployment and configuration problems on IIS, Azure, or other hosting environments.
Can you troubleshoot performance problems?
Yes, I identify bottlenecks in code, queries, and API calls, and recommend or implement fixes to improve performance.
Do you work with SQL Server or PostgreSQL?
Yes, I have hands-on experience with both and can troubleshoot issues in either database system.
Should I contact you before placing an order?
Yes, please. Message me with your error details first so I can confirm scope, timeline, and the right package for your issue.
