Weizhi Works

Production-ready apps, from idea to launch.

Native and cross-platform app developer since 2014. I build complex production mobile apps — and personal projects that feel calm, fast, and a little playful.

Start a mobile app project

A playful AI demo: describe your app and see how I could build it.

  • Available for new projects
  • Tokyo, Japan (JST)
  • Building apps since 2014
01

How I can help

Founders, small teams, and product owners who need a senior mobile engineer.

Native iOS apps

SwiftUI product work for polished, App Store-ready experiences.

Cross-platform apps

React Native, Expo, Flutter, and KMP — speed without losing craft.

MVP to production

A rough idea or prototype into a stable app people can use.

App architecture & design

Scalable architecture, clean module boundaries, and technical foundations that hold up as the app grows.

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Selected work

Apps I designed, built, and shipped end to end.

2026

A walking app for iPhone: walk or ride, your map fills in street by street, and the app suggests where to go next. Places you pass become stamps in city stamp books. Built end to end — the SwiftUI app, a Cloudflare backend, and a map pipeline from OpenStreetMap.

SwiftUIMapLibreCloudflare WorkersDurable ObjectsOpenStreetMap
One More Street 2One More Street 3One More Street 4One More Street 5One More Street 6One More Street 7

Slipsee

2026

An iOS app that turns receipts into spending insights. Scan receipts, track category trends and price changes, and ask questions with answers grounded in your receipts. No bank login required.

SwiftUITypeScriptCloudflare Workers
Download on theApp Store
Slipsee 1Slipsee 2Slipsee 3

Birdex UI

2026

An open-source, hand-drawn paper-&-crayon React Native design system — design tokens plus ~30 sketch-style components — extracted from my Birdex app. Ships with a runnable react-native-web gallery.

React NativeTypeScriptreact-native-svgDesign System
Birdex UI 1Birdex UI 2Birdex UI 3

Mood Recall

2026

A private journaling app that uses semantic search to surface past entries matching your current mood.

SwiftUISQLiteFAISSCore ML
Mood Recall 1Mood Recall 2Mood Recall 3

Nihongo Easy

2025

A calm Japanese typing dojo with adaptive drills for Hiragana, Katakana, and JLPT vocabulary.

ReactTypeScript
Nihongo Easy 1Nihongo Easy 2Nihongo Easy 3

Earlier experiments

  • 2025Calories AIAI-assisted calorie tracker built with Expo and OpenAI. Archived before launch.React Native · Expo · OpenAI · Firebase
  • 2020iBooks AnkiTurns Apple Books highlights into translated Anki flashcards automatically.JavaScript · Python
  • 2019Tubi TV FlutterA Flutter take on Tubi TV with video playback and the Tubi TV API.Flutter
  • 2019Flutter Classic KitRetro Flutter UI components inspired by Windows 95, 98, and XP.Flutter

Contact

Have a mobile app or product prototype in mind?

Available for new projects · Tokyo, Japan (JST)

Start a projecthello@weizhi.me
Hiring full-time?See my code on GitHub