Jin Hyung KANG
Portfolio document
Available for remote contract work

Jin Hyung KANG

Unity Gameplay Programmer / Game Developer

Gameplay Systems · Performance Optimization · Full-Cycle Development

  • Working with Unity and C# since 2018
  • 30+ mobile titles developed and delivered for five international publishers
  • Solo-developed title released on Steam and STOVE
  • One web service in production

Based in Seoul. I work your team's business hours.

View selected workGet in touch
30+
Titles developed and delivered
5
International publishers
approx. 2M
Demolding 3D downloads
1
Self-published Steam title
01Remote

Proven remote track record

Track record

Four years with five international publishers

Voodoo, Amanotes, Homa Games, BoomHits by BoomBit and Lion Studios. Contracts, project scope, schedules and day-to-day communication were handled over email, Slack and Skype.

Hours

Available during your team's working hours

I can align my schedule with the team or set a fixed overlap window when needed.

Communication

English collaboration over Slack

I worked in English for four years with business, QA and design teams. Progress and decisions were shared as they happened over Slack.

Contracting

International contracts since 2019

I have signed contracts with overseas publishers and received payments from abroad as a registered business in Korea.

Remote · 40 hours per week · can start now

02Work

Selected projects

Demolding 3D
2020Homa Games

Demolding 3D

A 3D simulation game built around the satisfaction of removing a finished product from its mold. After Homa Games launched its marketing campaign, the game reached about 2M downloads.

Role
Development lead and sole programmer
Team
3 people: developer, technical artist and designer
  • approx. 2M downloads
  • Runtime mesh deformation for molds and finished parts
  • Baked lighting and mobile performance optimization for low-end devices
UnityC#Mesh deformationBaked lightingiOSAndroid
Gameplay video
K-Games 3D
2021BoomHits by BoomBit

K-Games 3D

A 3D mobile game inspired by the Korean series Squid Game, built for BoomHits' UA testing. It recorded a $0.03 CPI.

Role
Development lead and sole programmer
Team
3 people: developer, technical artist and designer
  • $0.03 CPI
  • Iterated on the build using publisher UA test results
  • Handled contracts, schedules and day-to-day publisher communication over Slack and Skype
UnityC#GameAnalyticsIronSourceiOSAndroid
Gameplay video
The Secret Of Greenwood Isle
2025 ~ 2026Self-published

The Secret Of Greenwood Isle

I started this mystery visual novel to take a game from concept to release on my own. I handled the script, game design, Unity and C# development, UI, animation, sound and music, AI-assisted visual production, publishing and release operations.

On this project, I took responsibility for every area needed to ship. On a team, I respect each specialist's judgment and take clear ownership of my work as a developer.

Role
Solo developer
Team
Solo · 1 year
  • Released on Steam and STOVE, a South Korean PC game platform
  • Reached 104% of the crowdfunding goal
  • Handled store submission, age ratings, merchandise production and fulfillment
UnityC#SteamworksSTOVE
Steam page
03Playable

Play a Unity WebGL build in your browser

Hell Keeper. A casual slot-defense game I developed and released on ONE Store, a South Korean app marketplace. Hero, buff and augment data are separated into ScriptableObjects, with editor tooling for batch-generating augment assets and a runtime loading system. This WebGL port runs in the browser with no installation.

Modu Dining
Modu Dining
Modu Dining
Web · SaaS2026 ~

Modu Dining

A multilingual QR menu service for restaurants. One QR code presents the menu in each guest's language, and restaurant staff can update it themselves.

  • Live in production
  • LLM and API translation pipeline
  • Sole developer and operator
Next.jsTypeScriptSupabaseVercelLLM pipelineREST APIi18n
www.modudining.com
04Publisher work

30+ titles across six game companies · 2019 ~ 2024

I developed mobile games under contract with publishers in France, Vietnam, Poland and the United States, then joined a game studio in Korea. I developed and delivered 30+ titles under those publisher contracts, working remotely in English throughout. I worked in a three-person team with a technical artist and designer. They handled the art, while I handled development and publisher coordination. Supercent was a full-time, on-site role in Seoul.

Voodoo
2019.02 ~ 2019.08
Titles · 4

Tap X 2, Roll Down Bowling, Secret Shadow, RushHour Dash

Amanotes
2019.08 ~ 2019.12
Titles · 2

Music Roller, Slope Bowling

Homa Games
2020.01 ~ 2020.12
Titles · 4

Demolding 3D, Dancing Star, Rescue Dash, Dig & Mix

BoomHits by BoomBit
2021.01 ~ 2021.12
Titles · 6

K-Games 3D, Animal Clash, Dip & Sell, Dr. Syringe, Doll House DIY, Creature Rush

Lion Studios
2021.12 ~ 2022.08
Titles · 15

Press'em All, Blade Master 3D, Iconic Makeup 3D, Couple Rope 3D, Hat Designer, Airport Luggage Control, Laundry Master, Small Business Sort, Island Escape, Computer Art 3D, Eyebrows Art 3D, Tuft a Rug, Draw & Clean, Organize Your Stuff, Hexa World

Supercent
Role

Full-time client-side developer. Won 1st place in an internal game competition.

We completed a new title every two to three weeks for publisher CPI and A/B tests. Titles that performed well moved into further development. I turned movement, scaling, ad flow, animation, scroll views and the game manager into reusable systems, reducing setup work for each new title.

Some titles were developed under RevoluApps and Studio Aroka, the independent studio labels I used at the time.

View screenshots · 55
05Other software

Software beyond games

Tools and services that started with real needs and remain in use.

Steam Capsule Maker

Steam Capsule Maker

Web2024

I built this free web tool to automate the repetitive work of creating Steam capsule images. Add one image and it generates every capsule size required by Steam.

미세먼지 숨

미세먼지 숨

App2018

My first Android app, developed and released while I was a university student. It reads air-quality data from a public Korea Environment Corporation API and reached about 5,000 downloads without a marketing campaign.

06Engineering

Technical skills

Engine and languages

  • Unity
  • C#
  • ScriptableObject
  • UniTask
  • UniRx
  • DOTween
  • WebGL
  • OOP and abstraction

Rendering and profiling

  • Built-in RP
  • URP
  • Unity Profiler
  • Batching and draw calls
  • Overdraw
  • Lighting and bake
  • Runtime geometry

Shipping and integrations

  • App Store Connect
  • Google Play Console
  • Steamworks
  • Store review and ratings
  • IAP
  • GameAnalytics
  • IronSource
  • Unity Ads
  • Firebase

Web and backend

  • Next.js
  • TypeScript
  • Supabase
  • Vercel
  • Tailwind CSS
  • LLM pipelines
  • i18n

Other

  • Java
  • Kotlin
  • Flutter / Dart
  • Dart null safety
  • Stream-based async
  • BLE
  • Python
  • Git
  • Arduino
  • ESP-IDF / ESP-ADF
07Career

Career timeline

2018

First app, first award

Built while completing my electronic engineering degree.

2019 ~ 2022

Five international publishers

30+ mobile titles · four years of remote collaboration in English.

  • Voodoo · First overseas publisher contract
  • Amanotes · Music games
  • Homa Games · Development lead, Demolding 3Dapprox. 2M downloads
  • BoomHits by BoomBit · Development lead, K-Games 3D$0.03 CPI
  • Lion Studios · 15 mobile titles developed and delivered
2022 ~ 2023

Kookmin University

  • B.S. in Electronic EngineeringAll titles above were developed and delivered while I was a student
2023 ~ 2024

Supercent

  • Full-time client-side developer at a South Korean mobile game studioWon 1st place in an internal game competition
2025 ~ 2026

The Secret Of Greenwood Isle

Self-published on Steam and STOVE, a South Korean PC game platform.

  • I handled writing, game design, development, art, sound, crowdfunding, merchandise production and fulfillment.Reached 104% of the crowdfunding goal
  • To keep the project manageable as a solo developer, I used Midjourney and nijijourney for visuals and ElevenLabs for voice production.
  • Steam Capsule Maker grew out of the release process. I built it to automate repetitive capsule image work and released it for free.
2026 ~

Modu Dining

Multilingual QR menu service. Next.js, Supabase, LLM and API translation pipeline.

  • Built for a restaurant that needed a menu international guests could read. I now handle deployment, the database, storage, localization and incident response.Live in production
08Contact

Available for remote contract work

I’m available to start immediately and can commit to a full 40-hour workweek. I make it a point to respond within the same day and communicate in advance if anything may affect the schedule. Over four years of working with five publishers, I managed my own scope and timelines and proactively handled QA feedback and follow-up revisions.

sayneinteractive@gmail.comGitHub

Seoul, South Korea · developersayne.dev