---
title: "Buseong Kim · iOS Developer"
description: "iOS developer who loves Apple and learning—builds fast, shares knowledge, and aims for a better tomorrow with solid engineering culture."
canonical: https://portfolio.skyline23.com/en
language: en
content-signal: ai-train=no, search=yes, ai-input=yes
---

# Buseong Kim · iOS Developer

> iOS developer who loves Apple and learning—builds fast, shares knowledge, and aims for a better tomorrow with solid engineering culture.

## Profile

- Focus: Swift · SwiftUI, UIKit · RxSwift · Combine, MVVM · MVI · ReactorKit, Networking · Data, Fastlane · Firebase
- GitHub: [Skyline-23](https://github.com/Skyline-23)
- Blog: [blog.skyline23.com](https://blog.skyline23.com)

## Portfolio entries

- [Pylibkit](https://portfolio.skyline23.com/en/projects/pylibkit/index.md) — A toolkit that combines SwiftPM templates, a Python CLI, and signing automation so Apple-platform projects can bundle Python runtimes and packages with less setup.
  - Type: Project
  - Years: 2025
  - Stack: Swift, Python
  - Demo: https://pylibkit.org
- [zenz-coreml](https://portfolio.skyline23.com/en/projects/zenz-coreml/index.md) — An on-device ML experiment that converts PyTorch models, including stateful KV-cache variants, to Core ML for memory-constrained iOS keyboard inference.
  - Type: Project
  - Years: 2024 - 2025
  - Stack: Core ML, Swift, AI
  - Source: https://github.com/Skyline-23/zenz-CoreML
- [FloatingHUD](https://portfolio.skyline23.com/en/projects/floatinghud/index.md) — A reusable pure-SwiftUI HUD package with draggable, edge-snapping compact and expanded states for metrics and debugging overlays.
  - Type: Project
  - Years: 2025
  - Stack: Open-Source, SwiftUI, HUD
  - Source: https://github.com/Skyline-23/FloatingHUD
- [Applepie-RPC](https://portfolio.skyline23.com/en/projects/applepie-rpc/index.md) — A macOS app that publishes Apple Music and AirPlay device playback, including HomePod and Apple TV, as Discord Rich Presence.
  - Type: Project
  - Years: 2023
  - Stack: MacOS, Python, Swift
  - Source: https://github.com/Skyline-23/Applepie-RPC
- [Pixo](https://portfolio.skyline23.com/en/works/pixo/index.md) — iOS engineering work on BabyStory and SleepTune, covering product maintenance, an in-app story and diary flow, and a more interactive onboarding experience.
  - Type: Work experience
  - Years: 2022 - 2023
  - Stack: iOS, UIKit
- [BapJom](https://portfolio.skyline23.com/en/projects/bapjom/index.md) — A school meal iOS app built to replace inconvenient web lookups, developed and beta-tested by a small team led from the iOS side.
  - Type: Project
  - Years: 2021
  - Stack: Swift, UIKit
  - Source: https://github.com/Skyline-23/schoolmeal
- [Someday](https://portfolio.skyline23.com/en/projects/someday/index.md) — A tag-based diary app taken from product design through App Store release, with an emphasis on searchable records, privacy, and maintainable team architecture.
  - Type: Project
  - Years: 2022
  - Stack: UIKit, RxSwift, Diary, Product
  - Source: https://github.com/Someday-diary/Someday-iOS
- [RxLocalAuthentication](https://portfolio.skyline23.com/en/projects/rxlocalauthentication/index.md) — An open-source RxSwift wrapper around Apple's LocalAuthentication API that exposes Touch ID and Face ID operations as composable Single streams.
  - Type: Project
  - Years: 2022
  - Stack: RxSwift, Open-Source
  - Source: https://github.com/skyline23/RxLocalAuthentication
- [Knumarket](https://portfolio.skyline23.com/en/projects/knumarket/index.md) — iOS work on a campus group-buying app, focused on replacing Storyboards, standardizing architecture, and reducing coupling in a growing team codebase.
  - Type: Project
  - Years: 2021
  - Stack: UIKit, iOS
- [PlayKeyboard](https://portfolio.skyline23.com/en/works/playkeyboard/index.md) — Multi-year iOS keyboard engineering spanning product launches, extension performance, architecture modernization, CI/CD, and measurable conversion improvements.
  - Type: Work experience
  - Years: 2022 - 2023 - 2024
  - Stack: UIKit, SwiftUI, Keyboard, iOS

## Other languages

- [한국어 (KO)](https://portfolio.skyline23.com/ko/index.md)
- [日本語 (JA)](https://portfolio.skyline23.com/ja/index.md)

## Agent resources

- [LLM reading guide](https://portfolio.skyline23.com/llms.txt)
- [Complete portfolio index](https://portfolio.skyline23.com/llms-full.txt)
- [Portfolio reading skill](https://portfolio.skyline23.com/.well-known/agent-skills/public-portfolio/SKILL.md)
- Request this page with `Accept: text/markdown` for the compact Markdown representation.