I'm Koopa. I build web apps, mobile apps, and backend systems with Angular, Flutter, Go, and Rust.
Go · templ · goldmark
A local reader for Markdown notes and study materials.
See an outline and links from other notes as you read. Follow a study path chapter by chapter, or search for a passage and jump straight to it. Japanese reading aids include furigana and read-aloud.
Go · PostgreSQL · templ · htmx
A complete e-commerce shop, from browsing to checkout, after-sales and the back office that runs it.
Browse and compare products, check out, and track an order. Shop staff can manage inventory, fulfillment, and returns from the same application.
Flutter · Dart · Provider
Japanese reading practice for Traditional Chinese readers.
Practice kana, words, and kanji readings in short sessions. Listen to a phrase before revealing the text, or work through travel situations. Progress is saved on your device, with no account required.
I'm a full-stack engineer working across web, mobile, and backend systems.
I'm based in Taiwan and work remotely in English and Mandarin. I'm also learning Japanese, which led me to build Kotonoha for my own practice.
Tell me what you're building, where you need help, and any timing or budget constraints. A rough outline is enough to start the conversation.
