I offer mobile application development services for the iOS platform. My iOS app design capabilities include writing an app from scratch and working on existing apps (maintainance) by adding new features or implementing bug fixes. Besides native iOS application development, I am also knowledgeable in developing native Android applications as well as hybrid mobile applications using React Native. As an iOS developer, I have gained experience with developing, debugging, testing and submitting iOS apps to the AppStore and can provide a list of applications that I have personally developed or have participated which are already available in the Apple AppStore if requested. Below is a summary of my skills: •Strong knowledge in native iOS application development including familiarity with using the UIKit, Auto Layout, MapKit, Core Location, Core Data and Core Motion frameworks. •Solid skills in creating Storyboard-based layouts using Xcode and applying layout constraints in order to make the UI responsive to different iOS device screen sizes. •Knowledgeable in programmatic implementation of interfaces in iOS applications. •Capable of designing custom views that can be added to applications programmatically or through Storyboards. •Knowledgeable in building applications that consume REST APIs. •Familiarity with the process of releasing and submitting iOS application builds to the AppStore. •Experienced in maintainance of existing mobile application software including feature updates and bug fixes. •Solid understanding of object-oriented programming principles and concepts and capable of applying this knowledge using Swift and Objective-C. I also have developed "un-released" mobile applications using native iOS, and native Android, React Native and JavaScript/HTML/CSS3 which I have made publicly available in my GitHub page (https://lbchanjr.github.io).