SeongJun Ha Portfolio

Software Engineer based in Seoul, Korea. I love helping businesses grow through web and mobile apps. I pursue simple yet optimal user experiences and performance, focusing on solving user problems.

Previously at, LifeCare(Global), Social Investing Lab(Seoul), ASEADO(Seoul), SOTEC(Busan) Now at, OneBillionStudio(Seoul).

1 - Web App, SaaS

Hermont Fleet

2024

A Fleet Management System developed in collaboration with Hermont (Canada) and Amazon. This system manages all vehicle Maintenance, Repair, and Operations for Amazon.

2 - Web App, Education, Platform

PNUTBUTTER

2024

PNUTBTR is a health care web platform project that provides various educational content and products in addition to fitness and crossfit health care magazines.

3 - Web App, Sports

URBAN WAVE THROWDOWN

2024

URBAN WAVE THROWDOWN is a large-scale project co-hosted by Incheon City and various CrossFit-related companies, providing a variety of events for CrossFit enthusiasts. About 3,000 members participated, and the website achieved one million traffic during the offline competition period.

4 - Web App, Finance

INVESTORE

2024

INVESTORE is a service that allows users to record various trades and review market situations. This service helps users keep records of their investments and share them with other users.

5 - Web, Agency

OneBillionStudio

2024

OneBillionStudio is a service that allows you to subscribe to senior developers with an annual salary of 100 million won at a reasonable price.

6 - App, Education

Koredu

2023

Koredu is a service that allows users to learn Korean easily and enjoyably through YouTube. Users can watch YouTube videos, use a vocabulary notebook to memorize words, and access lecture functions.

7 - Web App, Education

Euang

2022

Euang is a parenting coaching service for new parents. I was responsible for the overall project lead, full-stack development, and operations.

8 - Web App, Finance & Investment

Coffee House

2021

Coffee House is a social stock trading and community app where users can buy and sell stocks and communicate with other users. I was responsible for full-stack development. The project progressed to Series A funding round.

9 - Web App, E-commerce

MIIMA MASK

2020

MIIMA MASK, one of Asea Do's main products, is the most preferred mask by the Korean Pharmacists Association and is a project with an annual sales of 40 billion won. As the development team leader, I was responsible for full-stack maintenance of the MIIMA MASK shopping mall, planning, designing, and developing regular delivery and admin site.

10 - Web, E-commerce

Mochipan

2020

I was responsible for some aspects of development including design and publishing for Mochipan, a North American Shopify-based kawaii-style shopping mall.

11 - Web/App, ERP system

Samsung Heavy Industries

2017

Collaborated with Samsung Heavy Industries Research Institute (Production ICT) to develop smart factory and ERP systems. Participated in various projects such as mobile drawing-less system, Smart 3D, E&I, Yard, and LNG as a full-stack developer.