Developed a back-office web app where our in-house support team manages the Gangnam Unni users and medical doctors

Developed an automatic sales statement managing system and reduced our in-house accountant's work by collaborating closely with the accountants and Shinhan Bank Open API engineers

Introduced an in-app web view that can be deployed separately by collaborating with our mobile app engineers

Developed the company blog (https://blog.gangnamunni.com) and the blog posting system in the back-office web app

Developed Class101 mobile application on Android & iOS platform with React Native

Developed class101.net web application with React

Testing a number of various features using Google Optimize.

Developed web server with TypeGraphQL, Typegoose, Apollo Server

Developed class101.net eCommerce system

Streaming class videos about 4TB every day in HLS with AWS MediaConvert

Developed a class editor where creators/directors can update class notes and upload videos

Developed and maintaining the game server

Developed and maintaining self-hosted GitLab CE

Developed Server-side In-App-Purchase Verification with PaymentWall

Developed Log Management System

Developed Resource Patch System

Developed Customer Inquiry Management System

Played a key role in developing web platform using React, Typescript, Redux-saga

Developed Android platform using Java and Android Studio

Monitored effectiveness of SEO in terms of traffic using Google Search Console and Google Analytics