Looking for referrals for some drainage work

Hi there..

We have recently done some additional patio/concrete work in our backyard. We love it, but it has now created a drainage problem. We disturbed the original gradework to allow for good drainage. Now we have a swamp pit with the just the slightest rainfall. Does anyone have someone they would recommend? It's not a large job and we, of course, are looking to not spend a fortune. Thanks in advance for any referrals!