I've built this kind of system before for more than one company. What you want to build is a continuous integration system (and this is what my company specializes in). This allows you to trigger tests each time a developer submits code. The test you describe would fire up several environments in...
Cross-functional, proactive, user focused: you do not want somebody who will stop if he does not have a wireframe to work from or who will not plan for common error messages just because that was not in the specs that were given to him. You need someone who loves the product you are building and ...
Just like most things, the answer is a bit of an "it depends" situation. Generally speaking the more your app functionality/features/experience is tied to calls and SMS then the more probabilistic it is you should need to test the interruptions. FWIW my firm has helped launch dozens of mobile ...
A good way to find devs that most probably haven't tried is Stackoverflow. Look for devs that have answered a lot of MacOS app related questions. Let me know if you want to chat more about this and other ways.
I'll cut right to the chase. You need to pay to get a good person. You are not selling a product with recurring revenues or a widget that a lot of people need. You do one-off projects for very custom business needs. These needs are random, and there is a LOT of competition. The person you wan...