There are many ways to find your great mobile app development partner. Here is what I can think of just right now LOL:
Reference: ask your friends who used to build a mobile app for true reviews and experience in finding a partner. Of course, they are reliable rather than any other suggestion.
Research: In case you are the first one to build a mobile app among your acquaintances, do a careful research based on facets: location, reviews, cost, ability & experience, technologies, etc. Have the shortlists and do not hesitate to contact them for the best choice.
Available list reviews by experts: Currently there are some websites reviewing about this, of course some of them must pay to appear on the pages; however, not at all, you can check all criteria to find suitable one ‘cause given information is reliable.
Just read more reviews. My advice is RubyGarage. If you want to know more about mobile application development with RubyGarage, it’s best to take a look at our amazing projects. They’ve developed all kinds of apps – marketplaces, finance apps, mobile solutions for IoT, and a whole lot more. Check out the link https://rubygarage.org/services/mobile-app-development