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Fix a .NET/C# API or backend issue

$80
Quantity
1
Delivery in
1 day
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What you get with this Offer

I will diagnose and fix one specific .NET/C# API or backend issue in an existing application.

This offer is ideal for clearly defined problems such as:

• ASP.NET Core or .NET application errors
• REST API endpoint issues
• HTTP 400, 401, 403, 404 or 500 errors
• Controller, routing or middleware problems
• Dependency Injection or service configuration issues
• Entity Framework / EF Core errors
• SQL Server or database-related problems
• JSON serialization or deserialization issues
• JWT authentication or authorization problems
• Async/await and backend logic bugs
• Configuration or environment-related errors
• Broken backend functionality
• Small performance or reliability issues

I will analyze the problem, identify the root cause, implement the appropriate fix, and test the affected functionality.

This offer covers ONE specific .NET/C# API or backend issue in an existing application.

Large new features, complete API development, major architectural changes, application migrations, extensive refactoring, cloud infrastructure work or multiple unrelated issues are not included and can be quoted separately.

Please contact me before purchasing if you are unsure whether your issue fits within this offer.

Delivery is within 24 hours after receiving the required source code, information and access.

Get more with Offer Add-ons

  • I can fix one additional related .NET/C# backend issue

    Additional 1 working day

    +$45
  • I can troubleshoot and optimize one EF Core or SQL query

    Additional 1 working day

    +$35
  • I can add automated unit or integration tests for the fix

    Additional 1 working day

    +$27

What the Freelancer needs to start the work

Please provide:

• A clear description of the issue and the expected behavior
• Steps to reproduce the problem
• Relevant error messages, logs, or screenshots
• The affected API endpoint or backend functionality
• Source code or repository access to the relevant project
• Relevant configuration details, such as .NET version and environment
• Database access, schema, or a backup only if required
• Test credentials if authentication or authorization is involved
• Swagger/OpenAPI documentation if applicable
• Details of any recent code, configuration, deployment, or database changes related to the issue

If possible, please provide a development or staging environment where the issue can be reproduced and tested safely.

For security, temporary or test credentials are preferred. Please avoid sending production passwords, API keys, or secrets unless they are strictly necessary.