Thorough .NET Developer for E-commerce Fix

I am looking for an experienced .NET developer to fix a specific issue in an existing wine e-commerce platform.

The application is built with C#, ASP.NET Core, Entity Framework Core, and SQL Server. The issue is related to the existing backend flow and may involve API logic, database queries, inventory checks, cart behavior, checkout, or order processing.

The task includes reviewing the relevant code, identifying the root cause, implementing a clean fix, and confirming that the current functionality still works correctly after the change.

I need someone who is comfortable debugging existing production code and working with:

ASP.NET Core Web API

C# business logic

Entity Framework Core

SQL Server

REST APIs

Validation and exception handling

Basic unit or regression testing

This is a small fixed-price task with a $30 budget, so I am looking for someone who can focus on the specific issue without expanding the scope unnecessarily.

Please apply if you have solid .NET experience, can understand an existing codebase quickly, and can start immediately.