For something like this, i'd ask claude code to review the project and create design and architecture documents for it.

Then i'd ask it to create a plan to recreate it in c#.

Next i'd ask claude code to generate a new project in c#, following the small steps it defined in the planning document.

Then i'd ask claude code to review its experience building the app and update the original plan document with these insights.

Then throw away the first c# project, and have another go at it. Make sure the plan includes starting with tests.