Applied in personal projects: SwiftUI, Combine, Swift Concurrency
- Built iOS CI/CD at Coinone and a shared CI/CD foundation at Hecto, eliminating local build dependencies so development could continue during deployments and any team member could deploy
- At Coinone, introduced Tuist and modularization standards, reducing build time by 10% and standardizing team project structure
- Independently planned, developed, and released 3 iOS apps after leaving Hecto, extending services to the web and Toss mini-apps with AI agents
Work Experience
Sep 2023 ~ Mar 2026
Hecto Innovation
iOS Developer / Senior
Mobile app development for card and telecom value-added services. Owned 9 apps total - 5 iOS Native (RxSwift, MVVM) and 4 Flutter (Clean Architecture) - with experience across native iOS, Flutter cross-platform development, and solo app ownership.
QoneSafe (Global Security iOS App)
Solo development | Nov 2025 ~ Jan 2026 | App Store release
- Solo development of global security iOS app for URL security checks and in-message URL analysis, from initial design through store release
- Safari Extension for real-time in-browser URL checks; Share Extension for URL sharing and analysis from external apps
- URL threat detection via Nurilab SDK integration
- WebView-based home screen; UIKit native screens for Extension setup guidance and app settings
- Built as English-only global app
Pet Care · Login Plus · Health Guardian · Info Guardian
Native + WebView Hybrid iOS App Operations | Solo ownership after handover, 4 apps
- Designed and applied UIScene migration (SceneDelegate, Info.plist) and supported major iOS releases
- Handled bug fixes, feature improvements, and production issues
Deepfake Protection · Family Care · EcoLetter · Weather Stone
Flutter | 4 new apps
- Developed and released 4 new Flutter apps in a team of 2 Android and 2 iOS developers (Clean Architecture, Riverpod, go_router)
- Jointly designed shared architecture, implemented core features, and integrated platform-specific functionality
- Developed and released Family Care, EcoLetter, and Weather Stone concurrently in about 1.5 months; shipped Deepfake Protection in about 3 weeks
Shared CI/CD Foundation (Android/iOS/Flutter)
GitLab CI · fastlane
- Designed and built a shared GitLab CI/CD foundation for Android/iOS/Flutter apps and standardized build and release processes
Internal AI Agent Guide Presentation (Feb 2026)
- Documented AI Agent Rules/Skills operating model and shared with the team to improve collaboration consistency
Apr 2020 ~ Aug 2023
Coinone Highlight
iOS Developer / Staff
Coinone Exchange App
iOS team of 6 | Swift, RxSwift, MVVM
- Real-time price and order book features with Socket + Protobuf
- WidgetKit asset and coin widgets
- Integrated an app security SDK for jailbreak detection
- Modularized the project with Tuist and standardized project structure and the build environment (10% reduction in build time)
- Built and operated Jenkins-based iOS CI/CD
- Participated in team code reviews before PR merge, managing code quality (SwiftLint)
- Led Swift 4.2 → 5.0 migration
Coinone PASS (Identity Verification / KYC App)
iOS solo | Swift, Facephi SDK
- Implemented ID capture and facial verification flows with the Facephi SDK to support KYC compliance under Korea's Act on Reporting and Using Specified Financial Transaction Information (approximately 2 months)
- Built capture guide UI to show positioning and status during ID and face capture
- Moved ID verification checks to the server to prevent bypassing or tampering with client-side decisions
- Integrated an app security SDK for jailbreak detection, applying the same security policy as the exchange app
- Masked the screen when the app entered the background to prevent personal information from appearing in the app switcher
Team Presentation · Tuist Introduction & Adoption
Team knowledge-sharing session
- Introduced Tuist's concepts and key features in a team presentation and adopted it in the project after reaching team consensus
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
- WebView-based iOS app development and maintenance for Hyundai Capital (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
Analyzes selected photos on-device for signs of AI generation and applies labels or blur to suspected AI-generated images on Safari webpages.
- Integrated the Smaug INT4 Core ML model and implemented the analysis pipeline in Swift, from image preprocessing through three-stage inference and score calculation
- Serialized inference requests with a dedicated actor and managed model memory lifetimes by loading and unloading models at each stage
- Implemented async/await-based photo analysis, task cancellation when leaving the screen, error handling, and retry flows
- Shared filter settings between the app and Safari extension through App Groups and synchronized image labeling and blur modes
- Built adaptive layouts for iPad screen sizes and orientations, with Dynamic Type and VoiceOver accessibility support
- Compared Swift preprocessing results with the original processing approach using 20 PNG images and verified the full inference flow on a physical iPhone
- Planned, developed, and released a Flutter app for daily guides, calendars, and connections on iOS/Android (Jan 2026); extended it to a Toss mini-app
- Organized state management and REST API integration with Riverpod, feature-based modules, and the Repository pattern
- Integrated Firebase Auth sign-in, FCM push notifications, deep links, iOS WidgetKit, and Android home widgets
- Implemented Korean/English localization, region-based routing, AdMob and Toss ad monetization, and Firebase Analytics/Crashlytics
Developer Tools & Automation Projects
Used AI agents for implementation while leading design, validation, and deployment.
MiniOps (Jun 2026 ~ Present)
Swift, SwiftUI, SPM (MiniOpsKit), Homebrew distribution | macOS
- Designed a signal, risk-management, and order-execution pipeline with loss limits, exposure caps, and decision audit logs
- Built staged validation from fee- and slippage-aware backtesting to walk-forward analysis, paper trading, and small-scale live trading
Education
Mokpo National University
B.S. in Multimedia Engineering
Mar 2009 ~ Feb 2016
About Me
Built iOS CI/CD at Coinone and a shared CI/CD foundation at Hecto Innovation. At Coinone, introduced Tuist in a team presentation before adopting it in the project and modularizing the codebase. At Hecto, prepared AI Agent usage guidelines and proposed approaches to modularization and documentation to the team. After leaving Hecto Innovation, I independently planned and shipped personal apps such as Picture Puzzle, SingleRoutine, and Amhaeng-eosa from concept to store release. I focus on turning repeated inefficiencies into standard processes, and whenever possible, I shape them into structures the team can actually use.
Additional
Military: Army Sergeant, Honorable Discharge (Jul 2010 – Apr 2012)
Certification: Information Processing Engineer / HRD Korea (May 2015)
