You will get ASP.NET Core Web API bugs diagnosed and fixed
Project details
Are you experiencing errors, unexpected responses, or performance issues in your ASP.NET Core Web API? I will diagnose and fix bugs in your application using C#, Entity Framework Core, and SQL Server.
I can help you with:
• HTTP 400, 401, 403, 404, and 500 errors
• Controller and service-layer bugs
• Entity Framework Core and LINQ query issues
• SQL Server integration problems
• Dependency injection and configuration errors
• Validation and exception handling
• API performance problems
• Testing endpoints with Swagger or Postman
I will review your code, reproduce the issue, identify its root cause, implement the appropriate fix, and test the affected functionality. You will receive the updated source code together with a brief explanation of the problem and solution.
Please contact me before ordering if your application contains multiple services or requires major new features.
I can help you with:
• HTTP 400, 401, 403, 404, and 500 errors
• Controller and service-layer bugs
• Entity Framework Core and LINQ query issues
• SQL Server integration problems
• Dependency injection and configuration errors
• Validation and exception handling
• API performance problems
• Testing endpoints with Swagger or Postman
I will review your code, reproduce the issue, identify its root cause, implement the appropriate fix, and test the affected functionality. You will receive the updated source code together with a brief explanation of the problem and solution.
Please contact me before ordering if your application contains multiple services or requires major new features.
Programming Languages
ASP.NET, C#Coding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$30
|
Standard
$70
|
Advanced
$140
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 5 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 1 | 1 | 1 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$15 - $50
Additional Revision
+$10Frequently asked questions
About Mazen
.NET Backend Developer | ASP.NET Core, Web API, SQL Server
Cairo, Egypt - 4:59 pm local time
I am a .NET Backend Developer specializing in ASP.NET Core Web API, C#, Entity Framework Core, and SQL Server. I help businesses and development teams build reliable APIs, improve existing backend systems, integrate third-party services, and resolve performance or architecture issues.
My backend development services include:
• ASP.NET Core Web API development
• RESTful API design and integration
• SQL Server database design and optimization
• Entity Framework Core and LINQ
• JWT authentication and role-based authorization
• Clean Architecture and Onion Architecture
• SignalR real-time notifications and chat
• Multi-tenant SaaS backend development
• API debugging, maintenance, and performance improvements
• Swagger, Postman, Git, and GitHub workflows
I have worked on backend systems for e-commerce, clinic management, university news, sports academy SaaS, and lost-and-found platforms. These projects included authentication, payments, subscriptions, reporting, notifications, file uploads, role management, and secure multi-tenant data isolation.
I focus on clean code, clear communication, and practical solutions that are easy to maintain and extend.
If you have a backend project, an API that needs fixing, or an existing .NET application that needs new features, send me a message with your requirements and I will suggest the most effective next step.
Steps for completing your project
After purchasing the project, send requirements so Mazen can start the project.
Delivery time starts when Mazen receives requirements from you.
Mazen works on your project following the steps below.
Revisions may occur after the delivery date.
Review and reproduce the issue
I will review the provided code, logs, and reproduction steps to understand and reproduce the reported issue.
Diagnose the root cause
I will inspect the API endpoints, business logic, Entity Framework queries, and database interactions to identify the root cause.