Architected and developed Android, iOS and web applications using latest technical trends.- Built and maintained MobiPrint Android & iOS applications. - Built MobiPrint customer portal web application to provide ticketing for issue, license purchasing and managing.- Built MobiPrint administrative web application for operation. - Built macOS printing application for Zebra printers with simple documenting user interfaces.- Built Android RFID scanning application for Apple internal usage.- Planed, drew architecture and built a bridged automated web service that receives orders from Amazon and eBay, and send 3rd party distributors with rules.- Built EV web application using nodejs, vue-js, socket.io and SmartCar APIs for power management of electric utility company.- Built initial version of document scanning feature with OpenCV.- Built initial version of simple chat for web and Android using Kafka for an Android app.- Performed Image processing with Kotlin and c++ with Android NDK.- Used shader codes with OpenGL on the Android device for shader animation.- Built custom UIs for configurations in the Android and iOS applications. Pre-defined UI type can be decided by remotely stored data. UI's all values, order and UI appending and removing can be managed by remote data.- Built intuitive and interactive interfaces with custom UIs and animation effects.- Used Android jetpack compose, and SwiftUI for iOS.- Used intent for Android to communicate with other applications, and deep linking to open application with parameters on Android and iOS- Optimized the app performance with various point of views- Designed the architecture of database, back-end & front-end for web and mobile application.- Integrate Google Sign in and Apple Sign In for the web, Android app and iOS app.

As a mobile application developer, design, build, test and release Android & iOS applications in Java, Kotlin and Swift. - Used Android Architecture Components to provide clean and scalable code with latest technologies- Used LifeCycles, LiveData, ViewModel and Room as an Android Architecture Components with RxJava and Dagger- Used firebase google sign in method and firestore cloud database - Used firestore snapshot listener to receive push event- Drew custom views like dynamically highlighted vertical slider, orbit view, multi label view, chart and clock- Created SQLite scheme for fast response and simple query- Used page transition animation and vector images for icon animation - Developed Android and iOS paired applications that use Bluetooth LE and UDP for communication

Part of a team member that would plan development and providing ERP system to clients as a mobile application developer. Design & develop native android, objective-C and swift mobile applications that communicate with ERP.- Developed retail store membership point application (Android) that communicate with WebService using JSON - Built a WebService(C#) that communicate with the POS and retail management web application- Developed IOS (Objective C) Show Module application that makes sales orders in SQLite and sends created sales orders to ERP- Developed Android wholesale application that makes sales orders and purchase orders in SQLite- Developed IOS (Swift) retailer application that makes purchase orders with complex categories of products- Maintained human resource management web application (PHP)- Maintained Hanhwa L&C web ERP(C#)- Developed Point of Sale Front-End application that communicate with receipt printer and EMV device (WPF)- Developed shipping label print web application that receives data from Walmart, eBay, Amazon and print labels with UPS, USPS and FedEx APIs- Converted Objective-C application to Swift- Developed Android inventory management application (SQLite) to shorten the time of gathering current inventory data for ERP- Developed and maintained wholesale web application

- Operated and coordinated General Motors manufacturing plant applications within the HP ITIL processes for the changes and incidents- Troubleshot incidents occurred during the production in a timely manner, resulting no lost unit, by managing the whole manufacturing system and prevented the impact to the other systems- Developed applications that communicate with PLC, miniPLC and Scanner through the com port using C#, which helped line worker’s productivity and quality of product and led to manufacturing cost reduction- Consulted with users when new vehicle models were in production and modified multiple applications based on their needs- Functioned as a core team member in resolving huge impact incidents and detail reviewed source codes before launching the applications- Introduced new applications to team members and instructed how to code and configure to launch