di.cs

//Assembly 1: Example.Entities.dll (no assembly references at all)
namespace Example.Entities
{
    //Customer does not implement interface
    public class Customer 
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}

//Assembly 2: Example.Logic.dll (no assembly reference except IoC container)
using System.Reflection;
namespace Example.Logic
{
    public interface ICustomer
    {
        public string FirstName { get; set;}
        public string LastName { get; set;}
    }

    public class BusinessLogic
    {
        public BusinessLogic()
        {
            var asm = Assembly.Load("Example.Entities");
            var concrete = asm.CreateInstance("Customer");
            //container maps via reflection or other duck typing magic?
            Container.For<ICustomer>().Use(() => concrete);
        }
        
        public void DoSomethingWithCustomer()
        {
            ICustomer customer = Container.GetInstance<ICustomer>();
        }
    }
}