Kim Phong

Software engineer · Tokyo

Hi, I'm Kim Phong.

About me

Writing

  1. Latest · Oct 2026

    Never bigger than a Pro Max: fitting an iPhone-only Flutter app onto the iPhone Duo

    Our Flutter app is iPhone-only and portrait-only. Instead of designing tablet layouts for the iPhone Duo, we cap its scale at an iPhone Pro Max, bound it by height, and hunt down everything that cached a size. flutterios
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Projects

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Feb 2026 — Present
FlutterNode.js

A household budgeting app that links bank, credit card, brokerage and e-money accounts and shows income and spending by category.

Highlights

  • Developed the iOS/Android app in Flutter and the backend APIs in Node.js through the 2026 launch, and continue to maintain both.
  • Integrated sign-in through an in-house OIDC-based SSO (Authorization Code + PKCE).
  • Built account linking for banks, credit cards, brokerages and e-money services.
  • Designed the Git branching and release workflow around Shorebird code push and GitHub Rulesets.
Jan 2024 — Jun 2024
watchOSSwiftUISwift

The Apple Watch version of a CFD trading app, for checking rates, charts and buying power and placing orders from the wrist.

Highlights

  • Built the watchOS app from scratch with SwiftUI: rates, charts, buying power, economic calendar and order placement from the watch.
  • Developed iPhone–Watch communication with WatchConnectivity, syncing account data from the iPhone app.
  • Released in 2024.