SwiftAVPlayer

A comprehensive iOS media player built with Swift and AVFoundation, featuring playback controls (play/pause/seek/skip/rewind), real-time progress tracking, and variable playback speed, with Combine-based state management.

SlotMachineAnimator

A lightweight UIKit-based slot machine animator for iOS with precise, customizable spin-to-index control.

Sendable-Concurrency

Sendable-Concurrency is a Swift project that explores the Sendable protocol and structured concurrency for writing safe, concurrent code.

Latest Posts (2025 ~)

(written in English)

• [Combine] Custom Publisher, Subscription, Subscriber
• [Swift] Generics
• [Swift] Trait Collection Issue I Faced with a Solution

(2016 ~ 2024)

(written in Korean)

• [SwiftUI] Managing Model Data
• [Apple] Certificates
• [Swift] MRC vs ARC
• [Swift] MVC vs MVVM

Kakao Entertainment — iOS Developer (2020 ~ Present)

We create and deliver webtoons and novels to audiences worldwide.

Swift, Combine, AVPlayer, JavaScript, Ruby, SwiftUI, Swift Concurrency, Firebase Crashlytics, VisionOS, Google Apps Script, Python, RxSwift, Git, JSON, REST API, Agile, JIRA, Confluence, Zeplin, Figma, MVVM, Code Review

• KakaoPage App ( Web ) , Tapas App ( Web ) , KakaoWebtoon App ( Web )
• Automated repetitive data conversion with a custom script, improving speed and efficiency.
• Refactored core logic with zero regressions.
• Authored and shared 8+ technical documents on iOS development.
• Built and released an iOS Ad Framework, adopted by Melon, KakaoWebtoon, and KakaoPage.
• Improved AVPlayer performance by 40% through optimization.
• Led VisionOS prototype project and attended Apple Lab Sessions.
• Supported global app launch in Taiwan, Thailand, and Indonesia.
• Developed 7 standalone pages and a slot-machine animation feature.
• Collaborated with cross-functional teams under agile sprints.

FnGuide — iOS Developer (2018 ~ 2020)

We provide companies with stock data and financial reports.

Swift, Objective-C, React Native, Android, Java, Kotlin, Backend, C#, ASP.NET, Node.js, REST API, Oracle DB, MSSQL, MySQL, FCM, GCP, API Integration, Alamofire, Zeplin, Mobile Auth

• Managed full app lifecycle—feature planning, development, database management, customer support, and App Store deployments.
• Supported Android, React Native, backend (C#, ASP.NET), and database operations (MSSQL, Oracle, MySQL).
• Independently handled certificate renewals, internal releases, and executive-level technical presentations.
• Built internal management apps that replaced manual SMS alerts with push notifications, streamlining company communication.