Jang-Ho Hwang

There has never been a better time to build things.

Frontend, infrastructure, product: if something isn't getting done, I'd rather do it myself. I work fully remote from Berlin, and this blog goes back to 2004.

Even on days off, I'm usually building something.

4,623 contributions on GitHub in the past year github.com/rath

What I'm building at work these days

BizRouter An LLM gateway for Korean companies: one API key for a dozen AI providers, billed in won. I built everything from the Rust proxy to the admin console. These days new people are working on it, so my commits have slowed down.
Wrks AI Image An image generator that doesn't require prompt skills. Pick a purpose, type in plain Korean, and you get an image.
Wrks AI Video Describe a scene in Korean and get a short video, sound included.
Wrks AI Notes Transcribes meeting recordings by speaker and pulls out decisions and action items.

The last three I build alone, from planning and design through development, operations, and infrastructure. In between, I put newly released models on H100s to see what they can do.

Things I build for myself

Anvil A dictation, TTS, and chat server that runs on my Mac with no cloud. One shortcut from the menu bar for voice input anywhere. Python with MLX, FastAPI, React.
Morax An iOS app that turns spoken thoughts into tasks, events, and notes. Audio is transcribed on the device and never leaves it. SwiftUI, Bun with Hono, SQLite.
Burrow A messenger for iOS and macOS made for a handful of close friends. Passkey sign-in, photos, videos, and calls. SwiftUI, Rust with PostgreSQL, WebSocket.
Butter A personal app for habits, notes, and photos. The server accepts client certificates only. Rust with PostgreSQL, Flutter.

My older iOS apps, Mouton Journal, and Orrery are on the works page.

Jang-Ho Hwang

What I'm building at work these days

Things I build for myself

Recent posts (in Korean)