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SangkuOH/README.md

Professional Summary

AI-native iOS Engineer building and shipping Apple-platform products with Codex as the primary engineering environment. I use agents, plugins, skills, and review loops to move from product intent to implementation, validation, and App Store release while keeping architecture, privacy, and shipping accountability intact.

Core Skills

  • AI-Native Workflow: Codex agents, plugins, skills, GitHub/Linear/App Store workflows, scoped task design
  • Apple Product Engineering: Swift, SwiftUI, Swift concurrency, SwiftData, CloudKit, WidgetKit, App Intents
  • Architecture & Quality: UDF, POP, actor-based services, XCTest/Swift Testing, Instruments, xcodebuild
  • Release Operations: App Store Connect automation with asc, Xcode Cloud, localization, PR/release gates

How I Work

  • Codex is the operating layer: agents handle scoped implementation, repo discovery, documentation, and validation work.
  • Plugins and skills connect the workflow to GitHub, Linear, iOS build/test tooling, visual QA, and App Store operations.
  • Human review stays focused on product judgment, architecture, privacy, performance, and release accountability.

Professional Experience

iOS Developer, lulu-lab (Sep. 2022 – Present)

  • Architected and delivered complex SwiftUI features using TCA and MVVM for maintainable, scalable code.
  • Managed asynchronous data flows with Combine and enforced coding standards via SwiftLint.
  • Implemented Xcode Cloud CI/CD pipelines for efficient, reliable build and release processes.

iOS Engineer, togi (Mar. 2022 – Aug. 2022)

  • Built data-driven SwiftUI interfaces and integrated Moya for efficient API communication.
  • Utilized TCA and Combine for modular, testable state management.
  • Automated deployment with Xcode Cloud for streamlined release cycles.

iOS Engineer, Fansation (Oct. 2021 – Feb. 2022)

  • Developed feature-rich SwiftUI apps using Combine, Alamofire, charts, and SocketIO for real-time functionalities.
  • Adopted MVVM for clear architectural boundaries and seamless scaling.
  • Employed SwiftLint and Fastlane to maintain code quality and accelerate releases.

iOS Developer, Cloud Hospital (Jul. 2021 – Oct. 2021)

  • Crafted intuitive healthcare interfaces in SwiftUI, integrated Combine and Alamofire for data handling.
  • Incorporated Azure Communications for secure, reliable telehealth solutions.

iOS Developer, Crinac (Dec. 2020 – Jul. 2021)

  • Created SwiftUI applications backed by Combine and Alamofire for robust data flows.
  • Employed MVVM for modular and easily maintainable codebases.
  • Iterated on UI/UX improvements and performance optimizations.

Highlighted Achievements

  • Successfully launched 6+ iOS apps, overseeing full lifecycle from ideation to App Store release.
  • Built and operated independent paid App Store products, including #1 paid chart and #1 Utilities category results.
  • Built Codex-first operating rules for production iOS repositories, combining agent execution with GitHub, Linear, App Store Connect, simulator/debug, and performance evidence.
  • Implemented custom design systems and reusable UI components, speeding up development.
  • Leveraged Swift concurrency for improved responsiveness and overall app performance.

Featured Project: SOURCE

Description: A cross-platform SaaS solution enhancing design team efficiency.

  • Tech Stack: Swift, SwiftUI, Swift concurrency, Combine
  • Key Achievements:
    • Ranked #17 on the App Store within three days of launch.
    • Selected for the 2024 Startup Incubation Package.
  • Contributions:
    • Established a VM pattern with clear View-Service-Network layers and protocol-driven abstractions.
    • Implemented xcstrings for streamlined kr/en localization.
    • Optimized user workflows for minimal input (image-based commenting, compression).
    • Integrated workspaces, public links, push notifications, and deep links for collaboration and navigation.
    • Maintained code quality via SwiftLint, tracked user behavior with GA/Google Crashlytics, and leveraged Xcode Cloud for CI/CD.
    • Employed 100% SwiftUI previews for rapid UI development and iteration.

Independent App Store Products

Kane - Expense Tracker

Description: A minimalist paid expense ledger focused on consistent spending and income logging, available on the App Store as a Finance/Lifestyle app.

  • App Store: Kane - Expense Tracker
  • Focus: SwiftUI product craft, SwiftData/CloudKit sync, widgets, localization, and App Store release operations
  • Product & Release:
    • Designed a clean, distraction-free expense tracking experience inspired by modern iOS visual language.
    • Built shared ledger sync, widget data pipelines, multi-currency support, and localized App Store presentation.
    • Ran a Codex-first repository workflow for validation, release evidence, and App Store operations.
    • Reached #1 on the App Store overall paid apps chart.
    • Took the product from development to a paid App Store listing.

RemotePad - Remote Desktop

Description: A paid remote desktop utility that turns a mobile device into a focused controller for a Mac over a local network or VPN.

  • App Store: RemotePad - Remote Desktop
  • Focus: SwiftUI, direct QUIC/TLS sessions, Bonjour discovery, screen streaming, input control, and macOS/iPadOS release flow
  • Product & Release:
    • Built the end-to-end host/viewer architecture for screen capture, streaming, touch, scroll, keyboard shortcut, and voice input control.
    • Added live connection health, permission guidance, VPN address storage, and multi-language App Store metadata.
    • Used Codex-guided workflows to coordinate performance investigations, release gates, PR closeout, and shipping decisions.
    • Reached #1 in the App Store Utilities category.
    • Shipped it as a paid App Store product.

Additional Information

  • Strong communicator, effective in cross-functional team environments.
  • Committed to continuous learning and integrating emerging Apple platform best practices.

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