Coders shouldn't be a black box that you hope to get the right answer out of. They should be talked to, but talked to as adults. You don't need to pressure them, you just need to ask for progress (not deadlines!) and help them resolve any issues they have.
Any programmers that have been beaten down in traditional shops will try to avoid the above because they'll think you're pressuring them slyly, instead of openly. You have to be absolutely open and honest and ethical about everything to overcome that.