As someone who is about to embark on a similar route, that&#x27;s interesting and exciting to hear. Was it both Android and iOS? If so, how much of the codebase&#x2F;time was spent on shared code versus needing to write platform-specific portions?<p>I&#x27;ve seen the Facebook post about developing Ads Manager (though it glosses over some details), but it would be interesting to hear other people&#x27;s experiences.<p><a href="https:&#x2F;&#x2F;code.facebook.com&#x2F;posts&#x2F;1189117404435352&#x2F;react-native-for-android-how-we-built-the-first-cross-platform-react-native-app&#x2F;" rel="nofollow">https:&#x2F;&#x2F;code.facebook.com&#x2F;posts&#x2F;1189117404435352&#x2F;react-nativ...</a>