[rdouble]

In another comment you said you're only asking him to work 1 to 5 hours a week. If the estimate 150 hours, he's got 9 months to 3 years to get the project done. If he started in May and has already gotten 100 hours in, he's far ahead of schedule.

In any case, few things of any importance are achieved in 1 hour per week. That is how much time I spend keeping my car clean.

Why don't you just hire a backend team in Poland like the frontend team you mentioned is doing a great job on the front end? Unless he's a genius and you're doing something really hairy I can't imagine it would take anyone long to understand the code. Just make sure you set commitment and deadline expectations properly this time.

It's more than a bit passive aggressive to call him a dick while posting under your own name on a public message board that loads of programmers (including probably him) read. The guy you have now will be relieved when you let him go.