Kuiduan Zeng

I build mobile apps. Next, ones that get you.

At Intuit, I built much of the new QuickBooks Mobile home page, used by millions. Engagement doubled. Before that, I shipped the app 200+ Lululemon stores use to stay in touch with guests. Next: full-stack, AI-first, and leading projects.

Open to interesting mobile + AI work. Say hi.

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Selected work. Things I’ve built to get better at the craft.

Module architecture diagram (feed and comments scenes, composers, UIKit layer) beside the running image-feed app

iOS app · ImageFeedApp · 2025 – 2026

Modular iOS Media Architecture

An image feed app with paginated loading, image comments, and an offline cache. I use it to practice modular, test-driven iOS design, and recently migrated it to Swift 6 with strict concurrency.

View on GitHub (opens external site)
  • Migrated to Swift 6 with strict concurrency set to complete, replaced Combine with async/await across feed, image, comments, and pagination loading, and made view protocols MainActor-isolated.
  • Separate modules for core feed logic, API, iOS UI, and app composition, each with its own tests: unit, snapshot, API end-to-end, cache integration, and UI acceptance tests, running in CI.
  • Thread-safe Core Data and in-memory caching with prefetching and request cancellation; profiled scrolling in Instruments and moved image decoding off the main thread to remove scroll hitches.
  • Requirements written as user stories and use cases, covering happy and sad paths, in the README.
  • Swift 6
  • Swift Concurrency
  • UIKit
  • Core Data
  • XCTest
  • Snapshot tests
  • CI

Open-source contribution · 2024

Firefox for iOS

A merged pull request to Mozilla’s Firefox for iOS, part of moving screens onto the app’s shared typography system.

View merged PR #21247 (opens external site)
  • Updated the wallpaper selector to use the FXFontStyles design-system fonts instead of the older DefaultDynamicFontHelper, with before/after screenshots for review.
  • Worked through Mozilla’s ticket, contribution, and code review process in a large production Swift codebase.
  • Swift
  • UIKit
  • Dynamic Type
  • Open source

Building with AI. How I work with models, day to day.

  1. 01

    Agents type. I think.

    Claude Code and Cursor run through my whole loop — planning, writing, refactors, tests, review — and I orchestrate several agents in parallel on bigger changes.

  2. 02

    No code I can’t explain.

    If an agent writes something I don’t understand, it doesn’t ship. The architecture calls, and the reasoning behind them, stay with me.

  3. 03

    Automating the pager.

    At Intuit I built AI workflows that summarize alerts and surface critical user reviews, giving on-call engineers back ~2 hours a week.

  4. 04

    Hand-written, on purpose.

    ImageFeedApp’s Swift 6 migration was all me — a side project to keep my concurrency and clean-architecture fundamentals sharp, so I can judge what agents write.

Experience. Where I’ve shipped iOS, and what I studied in between.

  1. Feb 2025 – Present

    Intuit Software Engineer, iOS

    Mountain View, CA

    • Core engineer on the QuickBooks Mobile home page redesign, used by millions — engagement rate doubled.
    • Ship CRM flows, in-app prompts, and shared, accessible UI components in SwiftUI and UIKit.
    • Built AI workflows that summarize alerts and surface critical user reviews, giving on-call engineers back ~2 hours a week.
    • Swift
    • SwiftUI
    • UIKit
    • Accessibility
    • Crashlytics
    • Claude Code

  2. 2023 – Dec 2024

    California State University, Fullerton M.S., Software Engineering

    Education · GPA 3.84 / 4.00

  3. Oct 2021 – May 2023

    Lululemon Athletica iOS Engineer

    Remote · Contract

    • Built the iOS app store associates use to stay in touch with guests — VoIP calls, call history, voicemail playback, offline support.
    • Launched in 200+ stores and used by thousands of associates.
    • Swift
    • CallKit
    • PushKit
    • Twilio Voice
    • AVFoundation
    • SQLite

  4. Apr 2021 – Sep 2021

    USAA Mobile Developer

    Remote · Contract

    • Shipped claims and roadside assistance features in USAA’s iOS and Android apps, including real-time tow-truck location updates.
    • Swift
    • Kotlin

  5. Mar 2020

    University of California San Diego B.S., Mathematics & Computer Science

    Education

Toolkit. What I reach for.

Languages
Swift, Objective-C, Kotlin (basic), Python
iOS
SwiftUI, UIKit, Swift Concurrency, Combine, Core Data, AVFoundation, CallKit
Architecture
MVVM, Modular architecture, Dependency injection, Feature-flagged rollout
Quality & Accessibility
XCTest, Swift Testing, Snapshot tests, Instruments, CI/CD, VoiceOver, Dynamic Type
Tools
Splunk, Crashlytics, Amplitude, Claude Code, Cursor