EFCore Conversion for SQL Server API POST Method to get the data

I'm in need of a skilled developer to convert my current code into Entity Framework Core (EFCore). The project involves:

- Converting in-line queries into Lambda expressions
- Ensuring compatibility with a SQL Server
- Tailoring the conversion for an API service, primarily focused on data retrieval

A deep understanding of EFCore, SQL Server and API service development is essential for this task.