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yangsijun/README.md

Sijun Yang (양시준)

"Polishing software with the heart of a master craftsman."

장인의 마음가짐으로 소프트웨어를 다듬어 가는 엔지니어.


Website LinkedIn Blog Email



About Me | 소개

I am a software engineer specialising in Apple platform development, with a focus on building intuitive, user-centred applications. My experience spans the full software development lifecycle—from initial concept through release and continuous improvement. I have a keen interest in software engineering principles and code quality, and I am passionate about leveraging AI to drive productivity innovation in development workflows.

저는 Apple 플랫폼 개발을 전문으로 하는 소프트웨어 엔지니어입니다. 직관적이고 사용자 중심의 애플리케이션을 개발하며, 초기 기획부터 출시, 그리고 지속적인 개선까지 소프트웨어 개발의 전 과정을 경험하고 있습니다. 소프트웨어 공학과 코드 품질에 깊은 관심을 가지고 있으며, AI를 활용한 개발 생산성 혁신에 열정을 쏟고 있습니다.



Current Role | 현재

CTO & Co-Founder at TNT Labs (Jan 2026 – Present)

Building an iOS/macOS startup focused on AI-powered productivity tools. Leading technical architecture and hands-on development.

TNT Labs에서 CTO & 공동창업자로서 AI 기반 생산성 도구를 개발하는 iOS/macOS 스타트업을 이끌고 있습니다.



Featured Projects | 주요 프로젝트

kip!

AI-powered memory assistant for iOS and macOS. Captures images and web links with AI-generated summaries, providing intelligent time and location-based reminder suggestions.

iOS/macOS용 AI 기반 메모리 어시스턴트. 이미지와 웹 링크를 AI 요약과 함께 저장하고 시간/장소 기반 알림을 추천합니다.

SwiftUI UIKit Foundation Models SwiftData CloudKit

App Store


ShowX

Indoor map application for Apple Developer Academy Showcase. First implementation of Apple Indoor Maps Programme in Korea, with manual IMDF data creation and Apple schema validation.

Apple Developer Academy 쇼케이스를 위한 실내지도 앱. Apple Indoor Maps Program을 한국에서 처음 적용한 사례입니다.

SwiftUI MapKit IMDF Core Location

App Store


Crown Prix

A minimalist 2D top-down racing game exclusively for Apple Watch. Features Digital Crown steering, 24 real-world F1 circuits from SVG data, sector timing with Game Center leaderboards, and an iOS companion app.

Apple Watch 전용 미니멀 2D 탑뷰 레이싱 게임. Digital Crown 조작, SVG 데이터 기반 24개 F1 서킷, 섹터 타이밍 및 Game Center 리더보드, iOS 컴패니언 앱을 제공합니다.

Swift SpriteKit SwiftUI Game Center WatchConnectivity

App Store GitHub


March 16

A beautifully crafted iOS app delivering daily Bible verses with calendar browsing, bookmarks, home screen widgets, social sharing, and notifications.

매일의 성경 말씀을 전달하는 iOS 앱. 달력 탐색, 북마크, 홈 화면 위젯, 소셜 공유, 알림 기능을 제공합니다.

SwiftUI SwiftData WidgetKit UserNotifications GRDB StoreKit

App Store GitHub


π (pi)

A Pi digit memorization app for iOS, iPadOS, and watchOS. Supports learning up to 10,000 digits with configurable chunk sizes, test mode with statistics, iPad Scribble input, and progress sync between devices.

원주율 암기 학습용 iOS/iPadOS/watchOS 앱. 10,000자리까지 학습 지원, 테스트 모드 및 통계, iPad Scribble 입력, 기기 간 진도 동기화 기능을 제공합니다.

SwiftUI SwiftData Observation WatchConnectivity

App Store GitHub



Technical Skills | 기술 스택

Apple Ecosystem

Swift SwiftUI UIKit iOS macOS

Server & Tools

Spring Boot Node.js



Experience | 경력

Period Organisation Role
2026.01 – Present TNT Labs CTO & Co-Founder
2025.03 – 2025.12 Apple Developer Academy @ POSTECH Learner
2023.04 – 2025.01 Republic of Korea Air Force Information Systems Technician - Staff Sergeant



Education | 학력

Handong Global University — BSc in AI Computer Science & Engineering

  • 2021.03 – 2022.12
  • 84/130 credits completed (FHEQ Level 5 equivalent)

Changwon Science High School

  • 2018.03 – 2021.02
  • Comparable to RQF Level 3



GitHub Stats

Top Languages

yangsijun's wakatime stats

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  1. HagaBible HagaBible Public

    Swift 2

  2. March-16 March-16 Public

    Swift 1

  3. Wordy Wordy Public

    Swift

  4. AirmailGPT-for-ROKAF AirmailGPT-for-ROKAF Public

    Automatically Mailing service for ROKAF Airman Basic.

    Dart 2

  5. Project-snasyd Project-snasyd Public

    AI for Connect6 (2022 Handong SW Festival)

    HTML 1

  6. Bible-Flash Bible-Flash Public

    성경 말씀을 빠르게 띄워주는 프로그램입니다.

    JavaScript 1