.NET backendsbuilt for enterprise,not demos.

// Controllers/OrdersController.cs
[ApiController]
[Route("api/[controller]")]
public class OrdersController : ControllerBase
{
    private readonly IOrderService _orderService;

    public OrdersController(IOrderService orderService)
        => _orderService = orderService;

    [HttpGet("{customerId}")]
    public async Task<ActionResult<List<OrderDto>>>
        GetByCustomer(Guid customerId)
    {
        var orders = await _orderService
            .GetByCustomerAsync(customerId);
        return Ok(orders);
    }
}
// ASP.NET Core. DI. Typed DTOs. Clean architecture.