C.H.
You could create a retainer wall to make a flat area -- that will have drainage holes.
I used Action Sprinklers because they were checked out for knowing how to do good drainage when leveling my yard but you may need someone who's good at retaining walls with guarantees too I presume. Call around, get free quotes, check Angie's List for good refernces. Don't ever do without because you didn't question is my motto.