How to find best app development company?

What's your process when trying to find the right app development company? Do you look at their portfolio, talk to their previous clients, go through their apps on app store and see how they are performing, read about them on app review sites like Clutch or Goodfirms, try to learn about their tech stacks as Android app development company or iPhone app development company?

This is for a survey I am conducting, so your answers would really be appreciated as they would help me understand how exactly can we provide businesses with a definitive guide on how to go about this process in a meaningful manner. 


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