iOS development

• e-commerce application, checkout/shopping cart service

• user behavior analytics

• RESTful network API

• database

• multithreading

• firebase

iOS APP development

• --Map location service

• --objective C

• --Core Bluetooth

• --Core Data

• --GCD/Multithreading

• --RESTful API

• --firebase

• --e-commerce

iOS SDK development for BLE wearable device

IOT product development

Android APP development for BLE manufacture tool

Ruby on Rails for RESTful Cloud server development

VoLTE/IMS/RCS/VoWiFi/SIP Protocol

System Software development on Mobile NAS, WiFi Router

System implementation on NAT traversal service