Jungwook Jun (전 정 욱)

iOS & Flutter Developer

Feb 4, 1991 (35) +82 10-2296-1815 wjswjddnr618@naver.com Sillim-dong, Gwanak-gu, Seoul, Korea Army Sergeant, Honorable Discharge (Jul 2010–Apr 2012)
한국어

Core Competencies

iOS Native (Swift)
Flutter / Dart
RxSwift / Combine
MVVM / Clean Architecture
CI/CD (FastLane, Jenkins, Bamboo)
Tuist / SPM
REST API / Socket
Firebase (Auth, FCM)
FastAPI
GA4 / BigQuery
  • 8+ years of iOS app development (Swift), Flutter mobile app development
  • Experience with crypto exchange and telecom/card company value-added service apps
  • CI/CD setup and automated deployment pipeline configuration
  • Tuist-based project modularization
  • Real-time data handling (Socket, Protobuf)
  • Agile, Sprint, Scrum experience

Work Experience

Sep 2023 ~ Mar 2026
Hecto Innovation
iOS Developer / Senior

Mobile app development for card/telecom company value-added services. Led 5 iOS Native and 4 Flutter apps out of 10 total.

Deepfake Protection Flutter App (AI Safety on iOS)
Aug 2025 ~ Mar 2026 | Flutter team of 4 (2 iOS)
  • AI deepfake and AI document detection telecom value-added service Flutter app
Family Care Flutter App
Apr 2025 ~ Feb 2026 | Flutter team of 3 (1 iOS)
  • Family care and academy ranking card company value-added service Flutter app
EcoLetter Flutter App
Mar 2025 ~ Present | Flutter team of 4 (2 iOS)
  • Carbon points and energy-saving telecom value-added service Flutter app
Weather Stone Flutter App
Feb 2025 ~ Jul 2025 | Flutter team of 4 (2 iOS)
  • Weather meme (weather-telling stone) Flutter app
Global Security Service (QoneSafe) iOS
Apr 2024 ~ Present | iOS solo
  • URL security check and SMS URL analysis global security iOS app
Pet Care iOS App
Sep 2023 ~ Mar 2026 | iOS solo
  • Pet care telecom value-added service iOS app
Login Plus iOS App
Sep 2023 ~ Mar 2026 | iOS solo
  • Real-time login alerts and quick input telecom value-added service iOS app
Health Guardian iOS App & SDK
Sep 2023 ~ Mar 2026 | iOS solo
  • Insurance and health info management telecom value-added service iOS app
Info Guardian iOS App
Sep 2023 ~ Mar 2026 | iOS solo
  • Wi-Fi security check and privacy monitoring telecom value-added service iOS app
Apr 2020 ~ Aug 2023
Coinone
iOS Developer / Staff
Coinone Exchange App
iOS team of 6
  • Swift 5, RxSwift, MVVM architecture, Socket Protobuf communication, CI/CD pipeline setup
  • Swift 4.2 → 5.0 migration and decimal tick size policy implementation
  • WebView integration, Posicube ID verification service implementation
  • Led Tuist adoption for project modularization and dev environment standardization
Coinone PASS
iOS solo
  • Face recognition SDK (Facephi) integration and AML (KYC) compliance features
  • Migrated ID verification from client-based to server-based architecture
Oct 2019 ~ Jan 2020
Yap Company
iOS Developer
Ttotta Subway (Accessibility) POC App
Nov 2019 ~ Dec 2019 | iOS solo | Swift 5.0, iBeacon, FCM, STT/TTS, REST API
  • Seoul Metro collaboration: accessibility-focused subway prototype app
May 2019 ~ Aug 2019
Hyundai Capital
iOS Developer / Freelance
  • iOS app development (freelance)
Aug 2016 ~ Nov 2018
Hanbit Soft
iOS/Android Developer
Jideokche Android/iOS
Jan 2017 ~ Nov 2018 | Solo | Java, Swift 3.0, Android Studio, Xcode
  • Knowledge and hobby learning platform connecting users with instructors; released on Google Play and App Store
Oct 2015 ~ May 2016
Online Powers
App/Embedded Developer
Beacon-based Attendance Service App
Jan 2016 ~ May 2016 | iOS solo | Java, Swift 2.0~3.0, Android Studio, Xcode
  • Beacon-based attendance Android and iOS app development

Troubleshooting & Issues

iOS Share Extension (Dec 18, 2024)

Share Extension app appeared first in URL share bottom sheet but disappeared from the second share onward

Solution Applied Share Extension plist Rule as query per Stack Overflow; resolved the issue
iOS UIKit UIScene Migration (May 14, 2025)

Apple recommendation: UIKit apps may fail to run without UIScene migration

Solution Applied UIScene migration across all apps
Xcode 16 Migration Issue

Widget crash when running iOS 15 Debug build with Xcode 16

Solution Set Enable Debug Dylib Support to NO in widget target Build Settings

Personal Projects

Today Guide (Jan 2026 ~ Present)
www.todayguide.site | Flutter, FastAPI, Postgres, Redis

iOS Android

  • Flutter (Riverpod, GoRouter) iOS/Android app with Material 3 and signature guide design
  • FCM push, Firebase Auth (Apple/Google/Email) login integration
  • FastAPI server, Postgres, Redis, Nginx deployment and scheduler operation
  • GA4 BigQuery daily report automation and Slack delivery; App/Play Store ratings, D1/D7/D30 retention reports
  • Feedback management, app version API, rate limiting, monitoring system
Today Guide · Toss In-App (Feb 2026 ~ Present)
React (WebView), FastAPI
  • Toss In-App SDK 2.0.0 integration and ad monetization
  • Web localization (KR/EN) and GEO-based routing
Magic One Line · Toss In-App (Apr 2026 ~ Present)
React, TypeScript, Vite, @apps-in-toss/web-framework, @toss/tds-mobile
  • Developed and operated a Toss mini-app ("Magic One Line") with the Toss web framework
  • Implemented a book-opening interaction UX with randomized one-line guidance messages
  • Built monetization flow with banner + interstitial ads (5-open gate, load waiting, resume recovery)
  • Designed analytics events (screen/click/impression) for user behavior tracking
  • Integrated TDS Mobile Provider and Toss backEvent handling with exit modal UX

Education

Mokpo National University
B.S. in Multimedia Engineering
Mar 2009 ~ Feb 2016
Gwangju Sejong High School
Graduated
Mar 2006 ~ Feb 2009

About Me

I enjoy development itself and am open to new technologies. I prefer to avoid work without a clear vision. I value communication in collaboration and tend to propose and execute process improvements when I have ideas.

Additional