Where can I repair my Dell laptop?
@City Center Computers one of the most reliable computers maintenance in the country.
Where can I find a place that sells laptop backpacks?
@City Center Computers (http://citycenter.jo), @Dara For Computers (https://darajo.com) , @EXXAB (https://www.exxab.com), @Mkateb.com (https://www.mkateb.com)
Where can I find application developers for mobile devices?
Share this on linkedin, there are alot of local freelance mobile developers out there. Also you can post your requirements on freelance.com, you'll get a lot of requests and work remotely.