Hi,
I have developed software for over 20 years, and iOS apps for over 3 years.
You can see some of the apps I wrote by searching for "naxomedia" on the App Store. While very different from your project, they illustrate the use of many iOS technologies, including databases, remote sync, and more.
I also have experience with geolocation, maps, etc.
I will develop a native iOS app, compatible with iOS 7 and 8, iPhone 4 and up, iPad 2 and up, and the associated backend.
The app will:
- display a map centred on the user's location, with the locations from the database
- a tap on a location will bring up a details page with name, address, phone, description
- it will also have a feature to add ad item with the same details
The backend will store the data and serve it to the apps. There will be a recurring charge to host it.
Note that the cost given does not include any graphical elements, icons, etc. The time given does not include validation time by Apple (about a week, more if they have any issues).
To publish the app, you will need your own iOS Developer program subscription from Apple. There is sometimes a bit of paperwork to set this up, so I recommend you get started as soon as possible to avoid any delays.
Let me know if you want different features or have any questions.
Note that I am based in London, which should make communication easier, least because we would be in the same timezone.
Jacques.