When I bought my house, I only had a sprinkler system in the front (which was not set up well). He has totally fixed the front yard system for me and installed an irrigation system for the back yard from scratch. They are very reliable and well priced.
We were going on vacation and I was worried the lawn would be dead when we got back. He replaced all the fixtures to an upgraded 2 level spraying nozzle. Now the lawn gets overlapping coverage. His price was very reasonable.