JobDetail job = new JobDetail("remotelyAddedJob", "default", typeof(DummyJob.DummyJob));

<job-type>Quartz.Job.NoOpJob, Quartz</job-type>

using System;
using Quartz;
using System.Reflection;
using System.Reflection.Emit;

namespace TestQuartzTaskCreator {
    public class FakeJob {
        public static Type Create(string assemblyName, string typeName){
            AssemblyName aName = new AssemblyName(assemblyName);
            AssemblyBuilder ab = AppDomain.CurrentDomain.DefineDynamicAssembly(
                    aName,
                    AssemblyBuilderAccess.RunAndSave);

            ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, aName.Name + ".dll");

            TypeBuilder tb = mb.DefineType(typeName, TypeAttributes.Public);

            tb.AddInterfaceImplementation(typeof(IJob));

            MethodBuilder meth = tb.DefineMethod(
                "Execute",
                MethodAttributes.Public | MethodAttributes.Virtual,
                typeof(void),
                new Type[] { typeof(JobExecutionContext) });

            meth.DefineParameter(1,
                ParameterAttributes.In,
                "context");

            ILGenerator methIL = meth.GetILGenerator();
            methIL.Emit(OpCodes.Ldarg_0);

            Type t = null;
            try {
                // Finish the type.
                t = tb.CreateType();
            }
            catch (Exception ex) {
                System.Console.WriteLine(ex.ToString());
            }

//            ab.Save(aName.Name + ".dll");

            return t;
        }
    }
}

JobDetail job = new JobDetail("remotelyAddedJob", "default", typeof(TestType));

JobDetail job = new JobDetail("remotelyAddedJob", "default", FakeJob.Create("TestAss", "TestType"));