Required Skills and Experience Probably about 7+ years of building iOS / Android (iPhone, iPad and universal) applications with relevant SDKs and Tools. Expert experience building in complex native mobile applications that successfully shipped to customers. Knowledge of native mobile design patterns (iOS / Android ) and experience building sleek, high performance user interfaces. Expert proficiency in Objective-C/ Cocoa, XCode and Android. High degree of proficiency in Xamarin framework. Expert knowledge of REST Services, Web APIs. Experience on web service integration (SOAP, REST, JSON, XML). Experience of development using web technologies. Good understanding of OO programming and design patterns. Good understanding of HTML5, JavaScript, jQuery and Ajax.